A 78-year-old holding a modern phone at default text size is fighting the hardware, not their eyesight. Before anyone suggests buying a “senior phone” with a keypad, spend twenty minutes rearranging the handset they already carry. What follows are the settings that change daily use; the rest is decoration.
Raise text size at the system level, then stop
On Android 12 and later, open Settings → Display → Font size and style and drag the slider two steps above default. Two steps, not the maximum — at the top setting WhatsApp message bubbles clip and banking apps push their confirm buttons off the bottom of the screen. If text is still tight, change Display size in the same menu instead: it scales the whole interface, buttons and icons included, without breaking text wrapping. Samsung labels it Screen zoom under Settings → Display.
iPhone splits the control in two. Settings → Display & Brightness → Text Size sets a global size; Settings → Accessibility → Display & Text Size → Larger Text unlocks the five steps above the normal range. Then enable Bold Text in that same menu. Thin 200-weight system fonts are the real problem on a bright screen, and bold at the current size reads better than larger thin text. On iOS 17 and later, Display Zoom → Larger Text enlarges everything the way Display size does on Android.
Reduce the home screen to four targets
Every extra icon is a small decision, and forty of them is a wall. On iPhone, clear the widgets, keep Phone, Messages, Camera and Photos in the dock, and let everything else fall into the App Library. Settings → Home Screen & App Library → Newly Downloaded Apps → App Library Only stops future installs from cluttering the grid at all. Then add the Contacts widget set to Favourites: long-press the wallpaper, tap +, search “Contacts”, choose the Favourites layout. Four faces, one tap, no scrolling.
Android is less tidy but workable. Long-press the home screen and open Home settings, or drag rarely used apps into a single folder called “Other”. On Samsung, Settings → Display → Easy mode produces a high-contrast three-column layout with oversized icons.
The strongest option is iOS 17’s Assistive Access: Settings → Accessibility → Assistive Access → Set Up Assistive Access. You choose which apps appear; the phone then shows them as a grid of huge tiles with a permanent Back button, the dialler displays three enormous keys, and leaving the mode requires a triple-click of the side button plus the passcode. It is the closest thing Apple ships to a purpose-built elder phone. Apple documents the rest of the feature set at apple.com/accessibility, and the Android equivalents are indexed in Google’s Android accessibility help.
If they read on the phone for an hour at night, the habits in reducing screen eye strain at night matter as much as the font slider — warm colour temperature and a dimmer screen beat larger text for comfort after dark.
Put medical details where a paramedic can find them
iPhone: open Health → profile picture → Medical ID → Edit, enter conditions, allergies and current medications, then switch on Show When Locked. Emergency services reach it by holding the side and volume buttons. Android: Settings → Safety & emergency → Medical information on Pixel, Settings → Safety and emergency on Samsung. Add two emergency contacts in the same screen — they can be dialled from the lock screen without the PIN.
While you are in there, write the PIN and the Apple or Google account password on paper and tell the family where it lives. A phone that locks everyone out after a fall is worse than no phone at all.
Be reachable without narrating menu paths
The most common support call is “I can’t find it”, and describing a menu over the phone rarely works. Look at the screen instead. On iPhone, start a FaceTime call, tap the display, then Share My Screen; they accept once and you watch what they see while they tap. On Android, install Google Meet and use the same share-screen button in a call. Samsung handsets ship with Smart Tutor, which passes full remote control to a helper who enters a six-digit code.
Two smaller habits pay off. Leave the wake phrase on — Hey Siri or Hey Google — because “call Rina” works when the icon cannot be found. And stretch the screen timeout to two minutes rather than thirty seconds (Settings → Display → Screen timeout), so the phone does not lock mid-sentence while they are reading a message.
If the handset rings all day with loan offers and recorded messages, solve that before the menus. The settings covered in blocking spam calls and texts silence most of it in ten minutes, and a phone that stops ringing at random is a phone an older relative will actually answer.
None of this requires a new device. A 2021 mid-range phone with two extra font steps, six icons and a filled-in Medical ID beats a current flagship left at factory defaults.