Installing ultrasn0w with active At&t SIM card in place?
Quick question guys, I am on the last step of unlocking my iphone with an active at&t SIM. With the SIM still in, I have upgraded cydia and added the repo code into it. I have ultrasn0w waiting to be installed, but question now is, I have turned off 3G, should I install ultrasn0w....turn off phone, eject at&t SIM and put my t-mobile SIM in?
I have an active at&t SIM card in so I could get the full MMS and push experience on t-mobile (just in case anyone was wondering )
iPhone 3G[s] (Black 32GB, Blackra1n JB 3.1.2, Blacksn0w UL 5.11)
It doesn't matter*. Install it with the AT&T or TMo SIM in. After install, put the SIM you want to use in and reboot the phone. It may even require you to toggle the flight mode on/off when it boots back up too.
Sometimes it does, sometimes it doesn't. It can be finicky a little at times when you switch SIMs. But once it establishes the signal/connection, usually, everything's good.
* assuming you have WiFi connection to connect and install from Cydia. If you don't have WiFi, then of course you have to have your AT&T SIM in to have data connection to install. And then your sequence is the right one to follow.