Knowledge Base - Settings: Set MNC to be 3 digits

IMSI coding doesn't have any bytes in the binary code showing if MNC should be 2 or 3 bytes. And if you read 3GPP TS 23.003
ii)  Mobile Network Code (MNC) consisting of two or three digits for GSM applications. The MNC identifies the home GSM PLMN of the mobile subscriber. The length of the MNC (two or three digits) depends on the value of the MCC.
So, MNC value is dependent on the value of MCC. And this is no problem in the backends where MCC and the corresponding length of MNC can be maintained in tables. However if some terminal / user equipment reads the IMSI it's not reasonable to maintain a table. So is this information stored somewhere? Yes the fourth byte of the file EF_AD maintains this information. 
So should you have some problems with APN populating MMC and MNC with wrong number of digits after reading IMSI, then please change the fourth digit in EF_AD to 4.


Created : 2016-05-25 11:44:14, Last Modified : 2016-05-25 11:44:14