Signal & Syntax · Networks, HLR and porting
What Is an IMSI?
The IMSI (International Mobile Subscriber Identity) is the up-to-15-digit code on a SIM. The IMSI names the subscription inside the network.The IMSI (International Mobile Subscriber Identity) is the up-to-15-digit code on a SIM. The IMSI names the subscription inside the network.The IMSI (International Mobile Subscriber Identity) is the up-to-15-digit code on a SIM. The IMSI names the subscription inside the network.
Also calledInternational Mobile Subscriber Identity
Example
234 15 1234567890 MCC MNC MSIN
IMSI in Practice
An IMSI starts with the An IMSI starts with the An IMSI starts with the MCC and MNCMCC and MNC of the issuing network, followed by the MSIN. The of the issuing network, followed by the MSIN. The of the issuing network, followed by the MSIN. The HLRHLR maps each IMSI to an maps each IMSI to an maps each IMSI to an MSISDNMSISDN. A new SIM brings a new IMSI while the MSISDN stays the same. Networks send a temporary code over the air in place of the IMSI.. A new SIM brings a new IMSI while the MSISDN stays the same. Networks send a temporary code over the air in place of the IMSI.. A new SIM brings a new IMSI while the MSISDN stays the same. Networks send a temporary code over the air in place of the IMSI.
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HLR Lookup vs eHLR
Two ways to check whether a number is in use. Read the guide →Run the Checks on Your Own List
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