I'm on 3.1.2 (not 3.1.3) on my iPhone 3gs.
Was thinking of going to http://www.benm.at/ and installing the revised carrier file (I'm in the US). Some questions...
a) Does this work for 3.1.2 and NOT kill MMS/Wifi (in other words, is the carrier file now available "foolproof"
b) I understand if I upgrade to 3.1.3, I will lose the carrier file? And OS 4.0 is around the corner. My needs for tethering would only be for a month while I travel. So when/if I update to 3.1.3/4.0 - will my phone be back to "spec" as per Apple (I won't have an issue updating and my carrier file will return to the official one?
Other option was to jailbreak. Which makes me then have a similar question - can I jailbreak now and then update to a later OS and have everything back to normal?
Thanks
Was thinking of going to http://www.benm.at/ and installing the revised carrier file (I'm in the US). Some questions...
a) Does this work for 3.1.2 and NOT kill MMS/Wifi (in other words, is the carrier file now available "foolproof"
b) I understand if I upgrade to 3.1.3, I will lose the carrier file? And OS 4.0 is around the corner. My needs for tethering would only be for a month while I travel. So when/if I update to 3.1.3/4.0 - will my phone be back to "spec" as per Apple (I won't have an issue updating and my carrier file will return to the official one?
Other option was to jailbreak. Which makes me then have a similar question - can I jailbreak now and then update to a later OS and have everything back to normal?
Thanks