iPhone · Research guidance. Instructions are based on publisher guidance; a UK IPTV account was not tested on this platform.
Separate text from the whole display
Small programme descriptions, tiny icons and subtitle lettering are different problems. Apple’s text controls target supported interface text, while Display Zoom enlarges more interface elements. Start with the item you need to read. A text-size change should not be described as increasing a video’s resolution or supplying a larger subtitle track automatically.
Use the accessibility text options
Open Settings, Accessibility, Display & Text Size. Apple documents Larger Text with a size slider and additional accessibility sizes, alongside Bold Text. Try a modest increase and inspect an actual programme description. Keep the previous choice available so you can compare rather than relying on memory of the earlier layout.
Review the current-app route
Apple also documents a Text Size control in Control Centre, which can be added if absent. Use the scope choices shown on the device carefully. If only one app needs a different appearance, the separate Per-App Settings workflow can be more intentional than changing every supported app at once.
Check support and fitting
Apple describes a preferred text size for supported apps. A custom player label may not follow it, and a programme’s subtitle controls may be separate. Check whether essential labels are cut off or buttons become difficult to reach. If the surrounding interface enlarges but the video captions do not, record those as separate results rather than declaring the setting ineffective.
Choose a usable combination
Read the programme list, open a title and return to playback at the intended size. If bold text improves recognition without excessive enlargement, that may suit the task better. Restore settings that do not help. The aim is a readable interaction, not the maximum available slider value or a claim that every app has been certified accessible.
Questions, answered
Does Larger Text affect every custom player?
Apple describes supported apps; test the actual labels and controls.
Is caption size necessarily controlled here?
No. Check the programme or system caption appearance controls separately.