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Can I use a foreign iPhone 4 in the US without any problems?

by bprimetimel / June 23, 2010 4:58 PM PDT

Hi, so I was thinking of getting a 'factory unlocked' iPhone 4 that they are selling in Europe and I was wondering if I would be able to use it here with T-Mobile without any problems if I download and install Apple's updates. Does anyone know? Would my phone's SIM get locked or would my phone become useless as other iPhones unlocked via hacking have been known to do? And would I be able to use the App Store on T-Mobile?


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by tkosgary / June 23, 2010 8:20 PM PDT

This should work same as iphone 3g/3gs right?

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keep in mind
by birdmantd Forum moderator / June 23, 2010 9:59 PM PDT

You will need to physically cut your SIM card for use in the iPhone 4 to fit in the micro SIM slot, not that it is difficult. Except for the size, there are no other physical differences between the two types of SIM cards (standard vs. micro). T-mobile cannot supply you w/ replacement micro SIM cards since they don't officially support the iPhone 4. Don't get me wrong, it will work.

You will need to change the internal data settings in the iPhone to work w/ T-mobile.

Finally, the phone will not operate on T-mobile's 3G data network and will be limited to EDGE data speeds because it lacks the 1700 mhz frequency.

Just wanted to point out the differences so you are fully aware to avoid any surprises later.

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by bprimetimel / June 24, 2010 1:09 AM PDT
In reply to: keep in mind

Hmm, okay, thanks but I knew all those things already. Would you happen to have the answers to my questions?

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by birdmantd Forum moderator / June 24, 2010 1:29 AM PDT
In reply to: okay...

A 3G/3GS will have the same data limitation w/ T-mobile but uses a standard SIM card. No other differences.

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Can't answer
by birdmantd Forum moderator / June 24, 2010 1:31 AM PDT
In reply to: okay...

I don't know the answer to your other question, just wanted to share what information I could.

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T-Mobile doesn't care
by Pepe7 / June 24, 2010 3:38 AM PDT

You will be fine on T-Mobile's network- they generally don't care about customers who bring in their own phones. If the phone will accept normal Apple updates (e.g. isn't jailbroken) you shouldn't have any problems. ATT would be a different story, of course.

The App store will work too since it's not tied to a carrier but to Apple. That's how they monetize the process.

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Ist 3gs ein Dual SIM Handy?

Ich habe gerade ein 3gs im efoxshop gesehen.Sie haben Dual SIM 3gs.Und unterst

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