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I-mobile IQ 9.2 phone locked?

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I recently bought this phone at the i-mobile shop at Central Airport Plaza in CM.

I used the phone using AIS while in CM. I am now back in the USA and want to use my AT&T Go

Phone sim. The sim is not recognized and it appears the phone is locked. The AT&T phone store said I need to contact either I-mobile or AIS.

Anyone else have this problem or know how to resolve it?

i suspect its a copy , i had a similar prob , took it back to thailand and they got my sim from UK to work in it , no shop in UK could unlock it and told me the it was a copy , had no IEMI number that was recognised , so was a fake , but i knew it was ,but i just presumed it would work with any network, which it now does , cost me a further 500b tho .

Some i-mobile phones come in two variants, a 9.2 and a 9.2a. The first works with 850/2100 the second on 900/2100. Even in Thailand, some i-mobile phones will work on AIS but not on Dtac. When you buy certain models the shop should ask you what SIM you will be using so they sell you a working phone. An AT&T shop in the US may not be aware of this. I doubt anyone is selling copy i-mobile phones. The knock-offs I've been offered have always been Samsung or iphone copies.

Some i-mobile phones come in two variants, a 9.2 and a 9.2a. The first works with 850/2100 the second on 900/2100.

850/2100 and 900/2100 refer to the 3G internet frequencies. That wouldn't stop it recognizing the sim or working as a standard phone with 2G internet.

The IQ9.2 uses 900/1800 Mhz for voice/2G connections though, while none of the USA companies operate on those frequencies so that would mean the phone wouldn't work there.

http://en.wikipedia.org/wiki/Cellular_frequencies

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