Hammer M 1L mobile phone two cards have no signal, please solve it! !

Hammer M 1L mobile phone two cards no signal reason:

1, SIM card problem of mobile phone:

(1)sim card is inserted backwards.

(2)sim card slot is loose

(3)sim card is damaged

2, mobile phone hardware problems:

(1) The mobile phone motherboard is in poor contact or damaged.

If the signal is not good in the corner of the house, you will lose the signal.

4, the influence of mobile phone signal jammer, resulting in no signal.

Solution of no signal in mobile phone;

1. Avoid using mobile phones in corners with poor signal.

2. Place the area under signal interference.

3. Set the network selection of mobile phone operators to automatic.