How do I choose the right eSIM plan for Japan?

Match your plan to trip length, expected daily data use, hotspot needs, and network quality in your destination. Short stays usually need less data, while remote work and video calls need more.

Where can I buy travel eSIM plans for Japan and Thailand?

Use the destination links in this guide to go directly to Roamify country pages, compare plan options, and complete checkout before departure.

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eSIM GuideFebruary 10, 20244 min read

How to Extend Phone Battery Life

Learn how to extend your phone battery life by optimizing settings, managing power-hungry apps, and using power-saving modes to keep your phone charged longer.

Michael Harbour

Roamify Editorial Team

Phone Battery #

Phone batteries are essential components that power our mobile devices. They store and provide electrical energy to keep our phones running. Here are some critical points about phone batteries:

‍Types of batteries: Most modern smartphones use lithium-ion (Li-ion) or lithium-polymer (Li-Po) batteries. These battery technologies offer higher energy density, longer lifespan, and faster charging than older battery types like nickel-cadmium (Ni-Cd) or nickel-metal hydride (Ni-MH).
‍Battery capacity: Battery capacity is measured in milliampere-hours (mAh) and represents the charge a battery can hold. A higher mAh rating generally means longer battery life, although actual usage may vary depending on screen brightness, app usage, and network connectivity.
Battery health indicators: Some smartphones provide battery health monitoring features that allow you to check the battery's condition. These indicators can show the percentage of maximum capacity remaining and give insights into the battery's performance.
Battery replacement: Over time, phone batteries may need to be replaced if they no longer hold a sufficient charge. Most smartphones have non-removable batteries, requiring professional assistance to replace them. It's advisable to consult the manufacturer or authorized service centers for battery replacement options.

Ways to Improve Battery Life #

Extending your phone's battery life involves adjusting settings, being mindful of certain habits, and taking care of the physical battery itself. Here's a comprehensive guide.

Screen Settings

Brightness: Reduce screen brightness or set it to auto-adjust based on ambient light.
Timeout: Shorten the screen timeout setting so the display turns off quicker when not in use.
Resolution: Some phones allow you to reduce screen resolution, which can save battery.
Dark Mode: Many apps and phone interfaces now offer a dark mode. This can save power on OLED and AMOLED screens as individual pixels are turned off for black areas.

Connectivity

Wi-Fi: Turn off Wi-Fi when you're not using it. If you're out and about without Wi-Fi access, your phone might waste energy searching for networks.
Bluetooth: Turn it off when not in use.
Airplane Mode: If you're in an area with poor cellular reception, your phone constantly searches for a signal, draining the battery. Consider switching to airplane mode.
Data: If not needed, switch off mobile data or use 3G instead of 4G/LTE, as the latter can consume more power.
Single Network: Some phones allow two SIMs to be active simultaneously. While it could be convenient, avoid it, as it could significantly affect your battery.

Apps and Notifications

Background Apps: Regularly close apps running in the background.
Updates: Update apps regularly, as newer versions might have optimizations to reduce battery usage.
Notifications: Limit app notifications. Each vibration or sound alert uses power.
Location Services: Turn off location services or set them to "While Using" for apps that don't need constant location tracking.‍
Battery Saver Mode: Most phones have a battery-saver or power-saving mode that limits background processes and notifications. Use it when your battery is low.
Temperature: Batteries don't like extreme temperatures. Avoid exposing your phone to very hot or cold conditions. For instance, please don't leave it in a hot car in summer.
Refresh Rates: Some modern phones have high refresh rate screens (e.g., 90Hz or 120Hz). While smoother, they consume more power. Consider reducing the refresh rate in settings.
Vibrations: Turn off haptic feedback (the little vibrations when you type or touch the screen).
Animations and Widgets: Reduce or remove animations and widgets that constantly update (like weather widgets).
Mail: Instead of having email push notifications, set your email to fetch manually or at longer intervals.

Battery Health #

Charging Habits: It's generally good for battery longevity to keep it between 20% and 80%. Constantly charging it to 100% or draining it completely can reduce its lifespan.
Quality Chargers: Use reputable chargers and cables. Cheap, non-certified chargers can harm your battery.

Following these tips and being mindful of your phone's habits can significantly extend its battery life and overall longevity.

Concern Over Battery Usage For Your Trip #

If the thought of depleting your phone's battery while on your trip is causing concern, there are proactive steps you can take to alleviate this worry. Packing an extra phone battery, charger, and USB adapter can provide a safety net for extended usage. Alternatively, you can explore our list of top 10 flagship phones that are great for traveling. However, even with these reliable options, avoiding excessive strain on the battery is crucial. For instance, refrain from keeping the screen on for extended video watching or gaming sessions to prevent overheating. Consider implementing our recommended Google Maps strategies during your travels to conserve battery life and minimize data consumption. One practical approach is to disable all apps that access data via cellular networks. By adopting these practices, you extend your battery's lifespan and manage your data usage more efficiently.

Other eSIM Tips & Guides #

Regular Restarts: Restart your phone occasionally. This can stop unnecessary processes and clear out temporary files.
Software Updates: Keep your phone's software updated. Manufacturers often release updates that optimize battery life.
Factory Reset: If your battery life is still poor after trying everything, consider a factory reset. This will remove any apps or settings causing the drain. Remember to back up your data first.

Frequently asked questions

You will learn how eSIM activation works, how to compare data plans, and which setup steps matter most before and during your trip.

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eSIM Guide

What Does Resetting Network Settings Do? (And When You Should Do It)

Wondering if you should reset your phone’s network settings to fix Wi‑Fi, mobile data, or Bluetooth issues? Learn exactly what a network reset does, what it doesn’t delete (like photos, apps, and contacts), when it actually helps, how it affects eSIMs and travel eSIM plans, and step‑by‑step instructions for iPhone and Android so you can safely troubleshoot connectivity problems in under a minute.

Donald BogleJun 28, 2026

eSIM Guide

How to Turn Off SOS on iPhone in 2026 (Quick Fix Guide)

Is your iPhone stuck on “SOS” or “SOS Only” with calls and data not working? Learn what SOS mode really means, why it happens (from weak signal and SIM issues to roaming and software glitches), and follow step‑by‑step fixes: toggle Airplane Mode, manually select your carrier, restart your iPhone, reseat your SIM, update carrier settings or iOS, and reset network settings. Traveling abroad? Discover how a travel eSIM like Roamify can instantly restore coverage in 200+ countries and prevent SOS mode at the airport.

James BrolinJun 27, 2026

eSIM Guide

How to Reset Network Settings on Android in 2026 (Step-by-Step)

Android phone showing signal but no data, travel eSIM not connecting, or Wi-Fi dropping? A quick network settings reset usually fixes these issues in under two minutes without deleting your photos or apps. Learn exactly what a network reset does, how to reset network settings on Samsung, Pixel, OnePlus, Xiaomi, Motorola and older Android versions, what happens to your eSIM, and the key steps to get back online fast after the reset.

Donald BogleJun 22, 2026

eSIM GuideFebruary 10, 20244 min read

How to Extend Phone Battery Life

Learn how to extend your phone battery life by optimizing settings, managing power-hungry apps, and using power-saving modes to keep your phone charged longer.

Michael Harbour

Roamify Editorial Team

Summarize with AI

Phone Battery #

Phone batteries are essential components that power our mobile devices. They store and provide electrical energy to keep our phones running. Here are some critical points about phone batteries:

‍Types of batteries: Most modern smartphones use lithium-ion (Li-ion) or lithium-polymer (Li-Po) batteries. These battery technologies offer higher energy density, longer lifespan, and faster charging than older battery types like nickel-cadmium (Ni-Cd) or nickel-metal hydride (Ni-MH).
‍Battery capacity: Battery capacity is measured in milliampere-hours (mAh) and represents the charge a battery can hold. A higher mAh rating generally means longer battery life, although actual usage may vary depending on screen brightness, app usage, and network connectivity.
Battery health indicators: Some smartphones provide battery health monitoring features that allow you to check the battery's condition. These indicators can show the percentage of maximum capacity remaining and give insights into the battery's performance.
Battery replacement: Over time, phone batteries may need to be replaced if they no longer hold a sufficient charge. Most smartphones have non-removable batteries, requiring professional assistance to replace them. It's advisable to consult the manufacturer or authorized service centers for battery replacement options.

Ways to Improve Battery Life #

Extending your phone's battery life involves adjusting settings, being mindful of certain habits, and taking care of the physical battery itself. Here's a comprehensive guide.

Screen Settings

Brightness: Reduce screen brightness or set it to auto-adjust based on ambient light.
Timeout: Shorten the screen timeout setting so the display turns off quicker when not in use.
Resolution: Some phones allow you to reduce screen resolution, which can save battery.
Dark Mode: Many apps and phone interfaces now offer a dark mode. This can save power on OLED and AMOLED screens as individual pixels are turned off for black areas.

Connectivity

Wi-Fi: Turn off Wi-Fi when you're not using it. If you're out and about without Wi-Fi access, your phone might waste energy searching for networks.
Bluetooth: Turn it off when not in use.
Airplane Mode: If you're in an area with poor cellular reception, your phone constantly searches for a signal, draining the battery. Consider switching to airplane mode.
Data: If not needed, switch off mobile data or use 3G instead of 4G/LTE, as the latter can consume more power.
Single Network: Some phones allow two SIMs to be active simultaneously. While it could be convenient, avoid it, as it could significantly affect your battery.

Apps and Notifications

Background Apps: Regularly close apps running in the background.
Updates: Update apps regularly, as newer versions might have optimizations to reduce battery usage.
Notifications: Limit app notifications. Each vibration or sound alert uses power.
Location Services: Turn off location services or set them to "While Using" for apps that don't need constant location tracking.‍
Battery Saver Mode: Most phones have a battery-saver or power-saving mode that limits background processes and notifications. Use it when your battery is low.
Temperature: Batteries don't like extreme temperatures. Avoid exposing your phone to very hot or cold conditions. For instance, please don't leave it in a hot car in summer.
Refresh Rates: Some modern phones have high refresh rate screens (e.g., 90Hz or 120Hz). While smoother, they consume more power. Consider reducing the refresh rate in settings.
Vibrations: Turn off haptic feedback (the little vibrations when you type or touch the screen).
Animations and Widgets: Reduce or remove animations and widgets that constantly update (like weather widgets).
Mail: Instead of having email push notifications, set your email to fetch manually or at longer intervals.

Battery Health #

Charging Habits: It's generally good for battery longevity to keep it between 20% and 80%. Constantly charging it to 100% or draining it completely can reduce its lifespan.
Quality Chargers: Use reputable chargers and cables. Cheap, non-certified chargers can harm your battery.

Following these tips and being mindful of your phone's habits can significantly extend its battery life and overall longevity.

Concern Over Battery Usage For Your Trip #

Other eSIM Tips & Guides #

Regular Restarts: Restart your phone occasionally. This can stop unnecessary processes and clear out temporary files.
Software Updates: Keep your phone's software updated. Manufacturers often release updates that optimize battery life.
Factory Reset: If your battery life is still poor after trying everything, consider a factory reset. This will remove any apps or settings causing the drain. Remember to back up your data first.