What is the reason why the newly bought Apple 6 mobile phone always reminds operators to update?

Causes and solutions:

1. Confirm whether it is a SIM card problem. After the steps of restarting the mobile phone and re-inserting the card are useless, find a mobile phone to confirm whether the SIM card is broken. If there is still no response on other mobile phones, the card is broken and needs to be reissued. If the SIM card occasionally has a signal and occasionally has no signal, it is caused by poor contact of the SIM card. A small piece of paper can be placed at the bottom of the SIM card for stable contact to solve the problem.

2. The factory settings are restored, and the mobile phone can't read the SIM card. Another reason is that there is something wrong with the baseband (a BIOS specially responsible for communication). In the case of upgrading the mobile phone system, brushing and poisoning, if the baseband is not brushed well or the virus destroys the baseband, there will be faults such as poor signal or no SM card. You can try to restore the factory settings and back them up first, such as address book, SMS, photos, etc. After the backup, you can go to the setting center to restore the factory settings.

Other reasons:

Because when you activated it, you may have used Unicom card, but now you are using a mobile card, or you may have turned it around. This is no problem, just press confirm.