patcat88
join:2002-04-05
Jamaica, NY
kudos:1 | reply to tomz17
Re: FCC said by tomz17:AFAIK, standard GSM just has facilities for a small "preferred" network list on the sim. I believe about 25 entries without any additional access information (i.e. you can still choose to use networks not on the list... the list is just there to guide the "automatic" network selection on the phone). This is NOT the same as an IRDB or PRL. This is why I was *more* optimistic about this working on GSM handsets. Everything else is controlled network-side. However, I bet there are clever SIM hacks (outside of GSM specs) you can pull off to block access to particular network. The question is only how motivated your carrier will be to actively block magic jack, and whether they can do so on existing sim cards. In GSM roaming, your roaming carrier will make a circuit between the SIM card in your phone, and your home carrier. Your home carrier will approve or deny every roaming attempt in real time, so the need for very long PRLs like on CDMA isn't needed with GSM. Geographically limiting roaming is done by the home carrier in real time, not a fixed list in the phone. |
