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Originally Posted by snaimon
2. I don't understand how, if I am in France with my German T-MO card, the call "must pass through the users home network". I am registered on SFR, right? Someone in France using SFR dials me; how does that call pass through Germany? Why? As I see it , the only way "passing thru" can happen is if SFR communicates behind the scenes with the German host network. Now my German cards were out of phone time but still in message time and they registered here in the US and I believe I could receive SMS messages, retrieve my balance and add money to the account. I could not dial out, however, as the call was not allowed. There is bound to be on the SIM card a set of approved roaming networks. I can understand the "behind the scenes" communication to check balances, but I would not equate that with your descripiton - "the call must pass through the users home network" statement.
Stan
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That is very easy.
The french user dials a german number.
The phone call gets directed to the T-Mobile switchboard in germany - then forwarded to SFR to terminate the call.
Chris