I have an iPhone 4 with a 01.59.00 baseband running iOS 4.0.1 (i dont upgrade often) with ultrasn0w 1.2.5 and I keep getting "SIM Invalid" or something similar as an error. I recently switched to a new T-Mobile SIM card from an older T-Mobile SIM under the same iOS and managed to unlock and use the previous SIM so I am unsure of the problem. I have restarted and uninstalled/reinstalled ultrasnow dozens of times and I have reset network settings so all of that is blank, but nothing seems to work. The SIM card I am using now came as a microSIM (so no cutting issues) and the account is activated already. Any ideas?
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Unlock Problems: Ultrasnow 1.2.5 on iPhone 4 (01.59.00)
- Thread starter mustnotsleep
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3G is off. This is actually the second SIM I have tried, the first was a regular SIM that I cut myself that did not work so I got a new one from the T-Mobile store (said I had lost mine). Neither has worked in spite of repeated restarts and uninstalling/reinstalling.
I KNOW THE ANSWER TO THIS (I swear). The new SIMs that T-Mobile are offering are 4G SIMs, they're a fresh roll out. Now, I haven't tested any of them in my family's factory unlocked iPhones, but all I can tell you is that they DO NOT WORK in any circumstance with Gevey. Only the 3G SIM that T-Mobile offered, and before, work. I'm not sure why this is the case, but maybe the incompatibility also applies to the baseband unlock.
EDIT: TL;DR, it's a SIM incompatibility issue. I tried three new 4G SIMs in my sister's iPhone 4 running a Gevey and they were never read at all. The 3G SIM I went and bought and activated was read immediately. Again, no clue if this applies to ultrasn0w unlocks, but that might be it!
Where do I obtain an older T-Mobile SIM card. Do you think they would have them in stock at the T-Mobile stores if I were to ask?
Most of the T-Mobile stores don't. One that I asked said I was basically antique hunting. Go to a third party authorized dealer, pay the small fee they charge, and you should have a working, older SIM. Make sure you specify what you need!
Your postulate about the phone being incompatible with the 4G SIM cards is invalid. I managed to get the same micro-SIM working instantly with a itunes restore and a factory unlock from AT&T.