Alice's iPhone 7 will change its signal from 1 bar to 5 bars even when she's not moving. What's the deal? Leo says that Alice's iPhone has a weak signal where she's located. Also, antenna signals can be attenuated depending on how she holds her phone, but it's likely she's just in a bad area for cell reception. But Leo says that since she also has the problem elsewhere, it may be a physical issue. And since Alice has had that phone for a few years, it may be time to get a new phone. One way to verify is to put a SIM card in from another carrier. If the problem persists, it's the phone.