Why no signal when 3G enabled on iPhone 3GS
For the longest time I was always getting NO SIGNAL when I enabled 3G on my iphone 3GS. If I disabled 3G, then I got a great signal.
Just in case some one else is baffled by this problem, this is what consistently fixed the problem for me. BTW, I am using Airvoice wireless (an AT&T MVNO).
I called this 3G test mode #, and it fixed my problem.
1. Disable 3G in /Settings/General/Cellular
2. Wait for carrier signal w/o 3G
3. Dail 3001#12345# , this returns an error message
4. Enable 3G in /Settings/General/Cellular
5. Wait for carrier signal w/ 3G
Once this is done, I can power on and off at will and consistently get 3G service. I only have to repeat these steps if I restored phone to defaults. I have a few 3GS phones, and I only had this problem on some of them.
your original post was about your 3GS. now your saying about an iphone 4?
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