Depending on what information is available, you might be able to get a good idea if it's fake or legit by looking at signal strength, jitter, latency when commu

Depending on what information is available, you might be able to get a good idea if it's fake or legit by looking at signal strength, jitter, latency when communicating with that tower. If the phone is mostly stationary, then there could be a cause for concern on the phone's behalf.