topic Problem with sim network WCDMA/GMS in M Series https://community.sony.co.uk/t5/m-series/problem-with-sim-network-wcdma-gms/m-p/3560377#M18943 <P>Hi im Cong, please help me resolve the error " disconnect or MMI invalid " when i choosen GSM for my sim network to one sim, and then another sim / 1 of 2 be OK with WCDMA, remain only GSM probably not connect due to occured error " MMI invalid"</P> Fri, 30 Jun 2017 08:48:52 GMT XuanCong 2017-06-30T08:48:52Z Problem with sim network WCDMA/GMS https://community.sony.co.uk/t5/m-series/problem-with-sim-network-wcdma-gms/m-p/3560377#M18943 <P>Hi im Cong, please help me resolve the error " disconnect or MMI invalid " when i choosen GSM for my sim network to one sim, and then another sim / 1 of 2 be OK with WCDMA, remain only GSM probably not connect due to occured error " MMI invalid"</P> Fri, 30 Jun 2017 08:48:52 GMT https://community.sony.co.uk/t5/m-series/problem-with-sim-network-wcdma-gms/m-p/3560377#M18943 XuanCong 2017-06-30T08:48:52Z