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.

MWI - Messages Waiting Indication

This indicates that there are one or more messages waiting to be delivered to the mobile due to previous unsuccessful delivery attempt(s ). The MWI is stored in the HLR (Home Location Register) and VLR (Visitor Location Register) with which an MS (Mobile Station) is associated.


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

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