I use the same SIM card in two older iPhones. My newer, preferred phone recently started getting terrible cellular data service, even in places where I know the coverage is normally strong. When I move the SIM into my older, somewhat damaged phone, the connection works normally and shows a strong signal. The newer phone worked perfectly with this SIM for about a year before the problem began, so I'm unsure whether this is a hardware issue, a setting, or something else. What should I check or try to fix it?
2 Answers
Since the SIM works normally in the other phone, the problem is probably specific to the newer iPhone rather than your account or the SIM itself. Try restarting it, toggling Airplane Mode, checking for a carrier settings update and iOS update, and resetting the network settings. Also inspect the SIM tray and check whether the phone’s antenna or cellular modem may have been damaged, especially if it was recently repaired. If none of that helps, a repair shop or Apple diagnostics can test the cellular hardware.
It could be a compatibility or band issue, since different iPhone models support different cellular frequencies and network technologies. However, because this phone worked normally for roughly a year, a sudden hardware fault, aging modem, or repair-related antenna problem seems more likely than basic incompatibility. Comparing the exact model numbers and carrier settings on both phones may still reveal a difference.
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