Its a reception issue, nothing to do with SIM.
That is normal behaviour for a phone if you are in a slightly iffy signal area. Number of bars doesn't indicate quality of connection.
Had the same with my O2 contract when I moved house. Switched networks to fix it.
Number of bars doesn't indicate quality of connection.
What does it indicate?
Strength.
A noise can be loud, but if the environment is echoey, or there are lots of other noises, you've no change of decoding it.
@croft started
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Its a reception issue, nothing to do with SIM.
That is normal behaviour for a phone if you are in a slightly iffy signal area. Number of bars doesn't indicate quality of connection.
Had the same with my O2 contract when I moved house. Switched networks to fix it.