Five kinds of mobile phones may cause no service.

There are five possibilities for this problem.

Mobile phone setting problem

Try another mobile phone. Maybe it's wrong. It is not excluded that some settings of your mobile phone have been tampered with. If you do this often, you should see a doctor.

Burning card or loose SIM card

If the card is burned, please bring your valid certificate to the local business hall to reissue it. Maybe the SIM card of your mobile phone card is loose. Please remove Kolor and try again.

Cell phone signal problem

The problem of cell phone signal! ! The mobile phone will automatically detect the network signal. If the mobile phone can't receive the network signal, it will prompt that there is no service. It is impossible to answer the phone, make a phone call or receive a text message at this time! After detecting the signal, it will automatically return to normal! !

Oxidation problem of mobile phone card

It is possible that the mobile phone card is over-oxidized. Try it with an eraser!

Software preferred service problem

It is possible that the mobile operator is wrongly selected in the preferred service of the software. China Unicom is the mobile operator, and China Unicom is the mobile operator.