The telecom 4g card suddenly lost its signal. What happened?

There may be several reasons why there is no signal on the telecom 4g card:

1. Check whether the SIM card is correctly inserted into the card slot. If not, you can pull it out again and try again.

2. Check whether the gold card area of the SIM card is obviously damaged or scratched. If scratches appear, it will cause poor contact and no signal.

3.SIM card may have poor contact after being used for a long time, so there is no signal on the telecom card.

4. The 4.SIM card slot is aging, or the signal off option is triggered in the mobile phone before the telecom card is shielded.

5. The remote area, telecom card can't detect the local signal, will also show no signal.