WiFi Extenders for Better Phone Coverage at Home

It can improve the phone's connection to a WiFi router in a weak-coverage area. It will not improve the phone's connection to the mobile network; that is cellular signal, not WiFi.

A separate router or repeater may extend the hotspot's WiFi network if compatible, but it cannot improve the cellular connection feeding the hotspot. Keep the phone where mobile reception is strongest.

Only if the phone has weak WiFi coverage from your router in a particular area. If other devices also struggle there, consider router placement or a compatible extender; if only cellular service is weak, a WiFi extender is not the fix.

Avoid improvised antenna modifications that may be ineffective or interfere with radio equipment. Start with router placement, supported WiFi bands and a properly designed range extender if the issue is local WiFi coverage.