I was introduced to AIS services such as one sim two number. The main idea about that concern for MSISDN,IMSI.
First, I please to explain the word "MSISDN" and "IMSI".
From wiki, MSISDN is a number uniquely identifying a subscription in a GSM or UMTS mobile network. IMSI is a unique number associated with all GSM and UMTS network mobile phone users.
As wiki said above ^. Someone may not get anything.
I please to make abstraction to tell you.
MSIDN = Mobile(Cellphone) number.
IMSI = identifier for each sim.(Global,standard)
So one sim two number mean to use two MISDN in one IMSI.
Now,what if I use one sim two number service?,Let's see what's going on.
When I call to the other by use USSD#(*200#). After that the MSC will query my profile at HLR then it's looking for all my services ,After a while it found that I am using one number two number service and then the HLR will reference to the record of the other HLR which I activated second MSISDN.
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