SIM card locks when I connect to my computer

Hi,
For some reason, my iphone's SIM card regularly locks when I connect to my MacBook Pro.
This means...without me always having time to see it, that my phone is basically out of use when I think it is charging or synching. Quite annoying, is there anything I should do about this?
I called my telephone carrier and they said they'd never heard of this problem that

Two things you can check that may be causing this: 1. Settings>Phone>Sim Pin do you have a sim pin enabled? 2. Some carriers require a PUK lock on all their sims, in the US you can get instructions on how to unlock the sim by using the PUK code online in your account info. I'm guessing that your sim either has a sim pin enabled or a PUK lock. If the latter, your carrier will need to supply the PUK code. Or, get a new sim.

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