[Openid-specs-risc] phone number discovery

Marius Scurtescu mscurtescu at google.com
Fri Oct 13 21:53:04 UTC 2017

Another issue that came up during the F2F at Amazon was phone number
discovery. How does an RP figure the issuer of a phone number, so it can
make subject add/remove API calls in order to receive RISC events for that

John Bradley provided the following information regarding phone number

There is a discovery service the GSMA runs for Mobile Connect that tells
> you the issuer for the phone number.
> That is part of the Mobile connect service.
> Phone numbers move between operators both cellular and fixed.
> You can find out who currently has it.
> Interestingly the lookup service offered by the GSMA is actually run by
> Apigee a Google sub.
> There is another paid one that the GSMA has with NeuStar called PathFinder
> https://www.neustar.biz/communications/address-and-routing/pathfinder
> The Mobile connect version that is free is just, Mobile connect
> operators.
> Google also has a SS7 connection to the network so for you you can find
> the current MCC/MNC at any time as well as info on if the phone is
> roaming:)  Any Phone company can do that.
> Some Phone Companies like DT in Germany provide a public API to look up
> any number in their MCC.

We have a somewhat similar challenge with email discovery, but that
deserves another thread.


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