Last year I discovered that Virgin Mobile Canada's [1] prepaid service worked quite well with an AT&T (GSM) post-contract unlocked iPhone 4S. It looked like for about $15-$20/month I could buy enough data to support email, iMessage and Facebook (with video autoplay disabled) [2].
That made me think about a battered AT&T iPhone 4 unlocked refurb phone with an old battery and balky Home button [4] we've been using as a backup. My Canadian sister has no computer or net access -- maybe I could set her up on Virgin with the iPhone 4.
A bit of research [2] suggests that the American GSM iPhone 4 should work on Virgin's network -- though at a slower rate than the 4S. (Virgin's SIM card FAQ IMEI lookup didn't recognize my IMEI, but I think I ran into that with the 4s too.) So the plan looked doable, but I wanted to give her a phone that would last -- and I didn't want to try my own repairs [5].
There are two options for refreshing an old iPhone 4 with a known defect (I don't know of any equivalent service for Android). You can pay about $170 for an Express Replacement or you can see what the local Apple store will do. If you do the Express Replacement or a typical Apple store refresh you'll probably get an AT&T locked iPhone back, and have to beg AT&T for help.
This time I tried my local Apple store -- and got a top notch "Genius". She decided to give me a refurb for $155, so I saved on the ERS fee. Even better, she said, I'd be getting an Apple unlocked refurb [6]. The entire process took about 15 minutes. Nice deal - looks good as new, fresh battery, home button should work for a while.
Except ... how could I tell it was really unlocked? I tried the erase/restore procedure for AT&T unlocks, but iTunes didn't show me the nice "Congratulations, your iPhone has been unlocked" message. I tried IMEI.info (surrendering more personal data), but it didn't recognize the IMEI. I think Factory Unlocks are different.
In the end I found two techniques. One is to inspect the Settings screens, there I found a "Carrier" menu I'm not used to seeing. It showed up with an old (inactive) AT&T SIM card inserted.
The Carrier menu let me select two carriers (after I turned off 3G data [7], I think T-Mobile only does EDGE data for the 4/4s though maybe a carrier settings update would help):
I had an old (inactive) T-Mobile SIM in my desk, so I tried that and got some more menus of interest:
and with the old T-Mobile SIM my carrier changed (though I still had no service)
So Apple delivered as promised. I think the Carrier options by themselves are a pretty good indicator of an Apple factory unlocked GSM phone.
- footnotes -
[1] A Bell Wireless Affiliate,
[2] Voice is 40 cents/min, so strictly for emergency. This strategy is a pure data play.
[3] Radios:
Bell Affiliates like Virgin use 850 and 1900MHz GSM frequencies (and some CDMA).
- GSM 850, 900, 1800, 1900 MHz
- HSDPA 14.4 Mbit/s, HSUPA 5.76 Mbit/s, UMTS, EDGE, EV-DO Rev.A
- GSM 850, 900, 1800, 1900 MHz
- HSDPA 7.2 Mbit/s, HSUPA 5.76 Mbit/s, UMTS, EDGE
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