How to use another SIM card with my AT&T Iphone

I have to go in france and use a French office' sim card from another provider than AT&T. But here, I've got all my professional, and private, mail box and conatct on it.
How have I to do in order to use this other sim card in my Iphone? I don't want to buy another cell phone for only few weeks in year !
When I was in france my provider was agree to unlock my old iphone before leaving the country. that's why that was easy for me to use it in US with an AT&T sim card. But now, they change my oldest 3g with a new one, it is impossible for me to have the same situation ...
and I'm a AT&T customer since more two years ...

There is no way to use a phone locked to AT&T with another provider. AT&T does not unlock iPhones for anyone. Ever..

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Hello i try to use another SIM card with my iphone 4s now it said i need to unlock the phone with my Sim carrier ... here is what it says below
The SIM card inserted in this iPhone does not appear to be supported.
The SIM card that you currently have installed in this iPhone is from a carrier that is not supported under the activation policy that is currently assigned by the activation server. This is not a hardware issue with the iPhone. Please insert another SIM card from a supported carrier or request that this iPhone be unlocked by your carrier. Please contact Apple for more information.

So.. You need to contact the carrier for the iPhone's original sim card, and request they unlock it. The carrier is the only one that can unlock the sim of the iPhone.

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I have a 3GS, out of contract with AT&T. I emailed for the unlock, and got an email saying:
"Request number: (xxxxxx)
Thank you for contacting AT&T Customer Care about unlocking your iPhone.
We have reviewed your request and confirmed that you are eligible to have the requested iPhone unlocked.
Please allow 24 hours upon receipt of this notification to complete the unlock.
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Additional information on unlocking can be found at http://support.apple.com/kb/TS3198
For questions regarding AT&T's wireless service and iPhone, please visit the Phone/Device Learning Center.
We thank you for your continued business.
You may also check the status of your unlock request by clicking the link for AT&T's Device Unlock Status Portal.
Sincerely,
AT&T Customer Care Team"
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Only if your phone is officially unlocked. Is it?

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Hi raffettax,
Time goes by and I have no answer. There is lso no answer on Movistar Communities, the only one is really disappointing and is not given by a Movistar employee. An iOS beta tester told that beta 2 resolved the issue, but with beta 3 it stops working again .
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Scraggy78 wrote:
Hi, I'm looking at two scenarios I need help with. I still have a contract for another 12 months with EE which gives me 2gb of data monthly on my ipad mini. If I sell the ipad mini can I use the micro SIM card in a......
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There�s a fair bit of documentation on NI�s site regarding the Applicom card.
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=====================================================
Fading out. " ... J. Arthur Rank on gong."

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Let me see if i got this straight. You have two iDevices. One is an iPad, which uses 3G Data. The other one is an iPhone 5s. You plan on purchasing two plans, One thats has only 3G Data, and the other one that has only phone calls, and messages.The answer to your question is Yes. At least i done that with t-mobile USA. If your iPad is compatible with nano-sim cards, yes you can. If not, you will have to buy an iPad with nano-sim such as the iPad mini 3G. This is totaly possible.

How to use another SIM card with my AT&T Iphone

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