The network signal symbol of the mobile phone changed from E to G, and the small arrow below disappeared, but there was a signal, so I couldn't make a phone call or send a text message. What happened?

According to your description, you can try the following methods:

1) It is suggested to change the network mode: Settings-More Settings-Mobile Network-Network Operator to re-select the search network.

2) It is recommended to take out the SIM card, wipe the SIM chip with an eraser, and then re-insert the SIM card into the mobile phone.

3) It is recommended to replace other SIM cards as much as possible.

4) If it still exists, it is recommended that you restore the machine to the factory settings and back up important data such as phone book, video and pictures in advance).

5) It is recommended that you try to upgrade the firmware.

If there are still problems through the above methods, please bring the three-guarantee certificate and the machine to the Samsung service center, and the engineer will check and deal with the machine. Please click the following link for the specific location of Samsung Service Center:/support/location/supportservice.do? Page = service. Location and place. cid = cn _ PPC _ support _ service _ repair net _ 120522

Welcome to Samsung service to make an appointment:

/reservation