The iPhone is designed so that you never need to open Settings. That is a reasonable design goal and it has a side effect: a great deal of useful capability sits behind menus most people never look at, configured to a default that suits the average user rather than you.
Some of these are conveniences. Several save meaningful amounts of data and battery, which matters more here than in the markets Apple designs defaults for. A few are privacy settings that most people would change immediately if they knew they existed.
This is a walk through the ones actually worth your time.
Data and cost
These first, because they save money.
Turn off Wi-Fi Assist. Settings, Cellular, scroll to the very bottom. This lets the phone silently switch to mobile data when Wi-Fi is weak. It is on by default, it is invisible when it happens, and it is a common cause of a data bundle vanishing while you believed you were on Wi-Fi. Turn it off.
Restrict per-app cellular data. Same screen. Scroll through the list and switch off mobile data for apps that have no business using it — games, streaming apps you only use at home, anything large. They will still work on Wi-Fi.
Low Data Mode. Settings, Cellular, Cellular Data Options, Data Mode. Reduces background refresh, automatic downloads and video quality on mobile data. There is a separate setting per Wi-Fi network too, under the network’s info button, which is useful on a metered hotspot.
Turn off automatic downloads over cellular. Settings, App Store, and check that App Downloads and Automatic Downloads are set to Wi-Fi only or to ask first.
iCloud Photos upload. Settings, Photos — make sure it is not uploading over mobile data.
WhatsApp media auto-download. Not in Settings but worth doing in the same session: WhatsApp, Settings, Storage and Data, and set photos, audio, video and documents to Wi-Fi only or never. This is frequently the single largest data consumer on a Nigerian phone.
Battery
Optimised Battery Charging. Settings, Battery, Battery Health & Charging. Should be on. It delays the last portion of charging to reduce time spent at 100%.
Background App Refresh. Settings, General, Background App Refresh. Set it to Wi-Fi only, or go through the list and disable it for everything except the few where fresh content matters.
Location precision. Settings, Privacy & Security, Location Services. Change apps from Always to While Using where appropriate, and turn off Precise Location for anything that only needs your general area — weather, news, shopping.
5G Auto. Settings, Cellular, Cellular Data Options, Voice & Data. Choosing 5G Auto rather than 5G On lets the phone use 5G only when it is genuinely better. Where coverage is patchy, this saves real battery.
Raise to Wake. Settings, Display & Brightness. Turning it off stops the screen lighting every time the phone moves.
Privacy
App Privacy Report. Settings, Privacy & Security, App Privacy Report. Turn it on and check it in a week. It shows which apps accessed your location, camera, microphone and contacts, and which domains they contacted. It is frequently illuminating and occasionally alarming.
Allow Apps to Request to Track. Same Privacy menu. Turning this off means apps cannot even ask.
Location Services, System Services. At the very bottom of the Location Services screen. Go in and review. Several of these can be switched off with no practical loss.
Analytics sharing. Settings, Privacy & Security, Analytics & Improvements. Turn off if you prefer.
Lock Screen access. Settings, Face ID & Passcode, scroll to “Allow Access When Locked”. Consider disabling Control Centre, USB Accessories and reply-with-message on the lock screen. This matters practically: it stops someone who has your phone from putting it in aeroplane mode to prevent you tracking it.
Stolen Device Protection. Settings, Face ID & Passcode. This is one of the most valuable recent additions and many people have not enabled it. It requires biometric authentication, with a delay, for sensitive changes when the phone is away from familiar locations — meaning someone who watched you type your passcode and then took the phone cannot immediately change your Apple account password. Turn this on.
Genuinely useful conveniences
Back Tap. Settings, Accessibility, Touch, Back Tap. Assign an action to a double or triple tap on the back of the phone — screenshot, torch, Control Centre, a shortcut. Hidden in accessibility, useful for everyone.
Text replacement. Settings, General, Keyboard, Text Replacement. Create shortcuts that expand into full text — your email address, your account number, a standard reply. Saves an enormous amount of typing over time.
Scan documents from Notes. Not a setting, but under-used: in Notes, tap the camera icon and choose Scan Documents. Produces properly cropped PDFs without any app.
Live Text. Point the camera at any text and select it. Works on printed documents, signs, receipts and screens.
Silence Unknown Callers. Settings, Apps, Phone. Sends calls from numbers not in your contacts straight to voicemail. Effective against the volume of spam and fraud calls, with the obvious caveat that you will miss legitimate unknown callers — useful if you are being targeted, less so if you take calls from new customers.
Emergency SOS and Medical ID. Settings, Health, Medical ID. Set it up. It is accessible from the lock screen and could matter.
Custom vibration patterns per contact, under a contact’s Edit, Ringtone, Vibration. Lets you know who is calling without looking.
Reduce White Point or Night Shift for reading in the dark.
Text size. Settings, Display & Brightness, Text Size — and separately in Accessibility for larger sizes.
Dark mode, which on OLED iPhones genuinely saves battery.
Storage
Offload Unused Apps. Settings, General, iPhone Storage. Removes apps you have not used while keeping their data, and restores them when you tap the icon.
Keep Messages for 1 Year rather than Forever. Settings, Apps, Messages. Message attachments accumulate for years and are a common hidden consumer of storage.
The short version
The settings worth changing today: turn off Wi-Fi Assist, restrict per-app cellular data, set WhatsApp media to Wi-Fi only, and enable Low Data Mode. Those four will save you money.
Then enable Stolen Device Protection and restrict lock screen access, which are the two that protect you if the phone is taken.
Then Optimised Battery Charging, Background App Refresh on Wi-Fi only, and 5G Auto for battery.
And set up Back Tap and Text Replacement, which are small conveniences you will use every day and would never have found.
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