Iphone 3.1.3 and Ipad
I have a 3.1.3 3gs iphone and Ipad. I live in Canada and have service from Telus.
I have used the bluetooth tethering to run my mac book pro. I have also used the mac book pro as a wireless router to for my iphones in hotels without wifi.
I bought the ipad in US last week. I tried to get ipad using 3gs by tethering with bluetooth last week in the US on AT&T and it did not work. My son stil has it and is returning from US today. I will try it on Telus network and hoping it will work here but not optimistic.
I have read and concluded:
1) You can jailbreak iphone and turn it into a wireless router
2) based on my experience in US with ATT bluetooth tethering did not work with Ipad an iphone
3) there is no jailbreak available yet for 3.1.3. It seems that everyone is waiting for os4 to come out and not putting energy to 3.1.3 jailbreak. iphoneland claims to jailbreak 3.1.3 for $25 but most posts say it is a scam so I am not willing to try it. I looked for a way to move back to 3.1.2 and jailbreak and wait and could not find it.
4) so you can get it to work with jailbreak and installing a wireless router app if you have an iphone lower than 3.1.3 is my conclusion. Which I don't have. And I will have to wait and hope that this is solved in os4.
If I am wrong on 3) please let me know. If you know of a way to move back to 3.1.2 please let me know as well.
I will let you know whether bluetooth tethering works in Canada when my son returns today. [He would not let it out of his hands when I left Las Angelos

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