Can Samsung gt b9 120 only insert Unicom cards?

Samsung gt b9 120 is the Unicom version of Samsung Amplifier 2, and the network standard supports GSM/WCDMA. You can use Unicom card or mobile card, and you can only use mobile 2G network to insert mobile card. If you can't use the mobile card, I suggest you check your mobile phone network settings, or whether the following conditions exist:

Whether it is 1. Insufficient contact between SIM card and metal contact of mobile phone;

2. Whether the 2.sim card is damaged, you can take out the mobile phone card and insert it into other mobile phones that support the mobile phone card. If it can't be used on other mobile phones, the SIM card may be damaged;

3. Whether the location is a signal blind area or there is no signal suddenly;

4. The mobile phone is in arrears, which makes the mobile phone card unusable. It is suggested to check whether there is any arrears.

Tips: It is recommended that you put your mobile phone card in other mobile phones for testing. If this still happens, I suggest you take your mobile phone card to the business hall for testing.