It's cold. How can I solve the problem without iphone service?

Any electronic products that need batteries should not encounter too low temperature. Try to put your mobile phone in your pocket or bag when it is outdoors in low temperature.

If there is a signal before, it suddenly shows that there is no service, then

1. Maybe your local signal is unstable or there is no signal.

2. The antenna in your mobile phone may be in poor contact due to falling and other reasons, especially the iPhone signal.

If there is no service because of the brush machine or there has been no service since I bought it, then

1. Your mobile phone is locked, so you can't use China's SIM card because it's not unlocked.

2. Other reasons for the quality problems of mobile phones are unknown for the time being.

Shut down and restart first, or click flight mode to restart the operator.