My mobile phone is Lenovo K860. I changed my 4G card yesterday. Then from time to time, the phone fails to send messages. What's going on? How to do it?

Dear Lenovo users, hello!

We are very sorry that this has caused confusion for you about the use of your device.

The K860 model supports WCDMA and GSM network standards, and can use China Mobile and China Unicom 2G cards and China Unicom 3G cards. Since k860 does not support 4G network LTE, if you use a 4G card and the problem of information being unable to be sent may be due to the incompatibility between the card and the mobile phone, it is recommended that you try changing the SIM card suitable for K860. Please understand.

For more FAQs, operation guides, download centers and service policies about K860, we recommend that you go to: /ProductDetail.aspx?id=669 to learn more.

Thank you for your support of Lenovo and wish you a happy life!