mobile-broadband-provider-info: Request for msisdn-query tag to be added

[Graham Inggs <graham inggs uct ac za>]

There is often a need to query the MSISDN (mobile telephone number)
associated with a GSM SIM card, for example when doing a pre-paid
top-up over the internet or when calling the network operator's
technical support.  Because this number can change, the only reliable
way of obtaining it is directly from the network operator.

Most Vodafone network operators and all of the network operators in
South Africa support querying the MSISDN by USSD, for example sending
'*111*501#' for Vodacom South Africa.

Would it be possible to extend the mobile-broadband-provider-info
database to include a msisdn-query tag please?