How to Check iPhone: Battery, Storage, and Speed in Minutes

Got an iPhone that feels slow, runs out of juice quickly, or shows a full‑storage warning? You don’t need a tech wizard to find out what’s going on. Below are the fastest ways to check the most common issues, all from within the phone.

Check Battery Health and Extend Charge Time

Open Settings → Battery → Battery Health & Charging. You’ll see a percentage that tells you the maximum capacity compared to a brand‑new iPhone. If it’s below 80 %, the battery is aging and a replacement will give you back most of the original runtime.

While you’re there, turn on Optimized Battery Charging. This feature learns your daily charging routine and pauses charging at 80 % until you need to unplug, which slows wear.

Find Out How Much Free Space You Have

Go to Settings → General → iPhone Storage. The bar chart breaks down what’s using space – apps, photos, system files, etc. Tap on each category to get tips like “Offload Unused Apps” which removes the app but keeps its data.

A quick trick: open the Files app and sort by size. Delete large videos or PDFs you no longer need, then empty the Recently Deleted folder to free the space for good.

Test Overall Performance Without Apps

If apps feel laggy, try a simple restart first – hold the power button, slide to power off, wait a few seconds, and turn it back on. A fresh start clears temporary caches that can slow the system.

For a deeper look, go to Settings → Privacy & Security → Analytics & Improvements → Analytics Data. Look for entries that start with “Crash” – many crashes indicate a problematic app. Deleting or updating that app often restores speed.

Use Hidden iPhone Codes for Quick Checks

Dial *3001#12345#* and hit call. This opens the Field Test Mode, where you can see signal strength in dBm, not just the bar icon. A reading around –70 dBm is solid; anything weaker than –100 dBm means you’re in a dead zone.

Another handy code is *#06# – it shows your device’s IMEI number. Keep that note handy if you ever need to verify ownership or report a lost phone.

When All Else Fails – Reset Settings

If the iPhone still feels off, go to Settings → General → Transfer or Reset iPhone → Reset → Reset All Settings. This won’t delete your apps or data, but it clears custom settings that might be causing glitches.

Follow these steps whenever you suspect a problem. By checking battery health, storage use, performance stats, and even signal strength, you can pinpoint the issue and fix it without a trip to the service center.

Keep this guide bookmarked – the next time your iPhone starts acting up, you’ll know exactly where to look.