Hi I have put a new SIM card in my Blackberry Bold but the message insert new SIM card keeps coming up and I can't use phone. The card works in other phones. I have taken out and put in several times, rebooted phone and so on, but it still won't work. Thanks
Is this the first SIM you have ever tried in this device? Since the SIM works fine in other devices, it may well be that the SIM card reader on your BB device has become damaged or otherwise failed. If such is the case, hardware level support would be required. If you remain in warranty, you could try to seek support under those terms. If you have no warranty, then you would seek out a local (to you) shop with a qualified BB technician to provide you with a proper evaluation and estimate.
Occam's Razor nearly always applies when troubleshooting technology issues!
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