Will Android add the contacts of the new SIM card to my Google Account?
What else could happen?
Will Android add the contacts of the new SIM card to my Google Account?
What else could happen?
You'd probably have a different phone number, and possibly a different contract/data plan for your device. If your device is SIM-locked, you might have no service at all (i.e. no calls, SMS, internet) if the SIM card is from the "wrong" provider.
Apart of that, nothing would happen: contacts on the SIM card are not synchronized with any account.
Q & A