>> Each SIM has a 'default' number, and if they want to instead use a
number they
>> pre-registred, have them text a 'token' (long enough not to guess a
>> valid one, but not too long as to be annoying).
>> That token is just displayed on eventphone.de when they register a
>> number as 'GSM' without an IMSI.
>
>ok, the other way around.  The token is a unique value that they have
to SMS to
>OpenBSC... great idea.  I like it that way.

i would like to ask eventphone to add a 10 digits token to the
registration tool. this way it is hard enough guess. the token shall be
generated randomly when not yet assigned to a phone number. the token is
used to authenticate:

- by sending SMS with the token (like said above)
- by dialing a service number and entering the token
- by giving the token to the GSM help desk.



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