Covid 19 Update: Given the current global situation, we have paused the delivery of our LiveOnsite courses, but our LiveOnline and OnlineAnytime Packages remain unaffected. Browse over 50 online courses in our course catalogue, or get in touch to register your interest in future LiveOnsite courses when we are able to safely resume in person training.

IMSI - International Mobile Subscriber Identity

The International Mobile Subscriber Identity is a unique identifier allocated to each mobile subscriber in a GSM, UMTS, LTE and 5G network. It consists of a MCC (Mobile Country Code), a MNC (Mobile Network Code) and a MSIN (Mobile Subscriber Identification Number).


  • Fully interactive 3GPP based network map
  • Narrated call flows
  • Detailed network procedures

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