HT1807 No service with foreign sim on unlocked iphone 4

I recently got my iPhone unlocked by AT&T. I inserted an international sim in it which has worked fine on other unlocked devices. I get a really low Tmobile signal and am unable to make any calls. Does anyone know how I can fix this?

reset the settings from settings>general>reset>reset all settings

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HT201263 its sayin no service but have sim card in iphone?

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an connect to itunes i am thats what says in iphone thats all i have so far tho it has itunes symbol usb plug with arrow when connect to itunes, if some one has gone all the way with factory settings please Help email m at [email protected] i would like if someone could solve this problem

Do you have a plan or contract with a carrier?

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Do you have information about the model no. of original purchase that is printed on the back cover ?
What is model no. of the replacement iPhone 5 ?
If T-mobile SIM worked on the original purchase and does not work on the replacement iPhone 5, they gave you a wrong model.

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I have an unlocked iPhone 4s and i plan to go overseas i want to get a sim card over there but will i have to activate through iTunes like i did when i first got the phone? or is it just insert and use?
thanks in advance

TFA, sorry to bump an old thread, but I'm in a similar situation - my dad wants to buy an unlocked iPhone 4s which he will use primarily with a UK sim, however he's going to Thailand for 4 months over the winter and will want to put a Thai sim in for this period, and then when he gets back to England, put his UK sim back in.
Did you find that the overseas sim worked straight away after plugging it in (or did you need to sync it), and was this the same when you put your home sim back in?
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I will be traveling in Europe with my unlocked iPhone5. I will be getting an Italian sim card. Are my apps on my sim card or on my phone or both? How do I make sure they are on the phone so that I can use them when I have a different sim card?

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With just one contact on my 9700 (TIM Italy) I suddenly can't bbm or pin. He can send me messages, but not me to him. Pin says service blocked.
if i remove my sim card and i use one from the same country as him, it works!!
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We definitely understand your frustrations Lukemilano but this is just a peer-to-peer support forums and we are not Technical Supports who work for RIM, we are also Blackberry users who support one another.
If you want Expert and Professional Solutions, you may access this website for Blackberry's fee-based support for Consumers, Corporate Administrators, Wireless Service Providers and Developers. They also have the Incident-based support. Hope this helps you find the solutions.
http://www.blackberry.com/contact/
Ron
Click "Accept as Solution" if your problem is solved. To give thanks, click thumbs up Blackberry Battery Saving Tips | Follow me on Twitter

HT1807 No service with I phone 4 in Europe

My I phone 4 has no cellular service abroad. I tried all trouble shooting, reset network connection. The I phone does see the carriers but keeps searching and fails to connect. I keep getting message: your cellular data has been lost. I have been in Europe 4 times this year and I have never been able to use iPhone to make calls. Also tried to delete and set up as a new iPhone, to no avail. Software is all up to date

Yes, all 3 things have been done. Bell told me they have never heard if the issue and apple advised me to delete all settings and set it up as a new I phone. I did all that and just went to Europe and still can not connect to European carriers even though they iPhone shows that they are available

Why my iphone cannot update an no service with my sim kad ?

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I'm using iPhone 3GS iOS 6.1 with 05.13.04 Baseband. My phone is Factory Unlocked with Turkey / Avea. But I get "No Service" error. Why does this happen and how do I fix it? I'm already using an Avea SIM Card.

Contact Avea about this. Here's how:
Contact a mobile carrier

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I bought a factory unlocked 16GB iPhone 5 from USA. When I insert Airtel (india) nano sim, it says Sim not valid.
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My friend is going over to Turkey for a few weeks and would like to use a local sim card for making calls/data.
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Hobbs's link doesn't apply to your question, so you can ignore it.
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http://support.apple.com/kb/ht1937

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i have contacted my carrier about unlocking iphone4. so they said it will be done but its been a week ago and still the iphone its locked

Talk to your carrier, then. These are user forums, and you are not speaking to Apple here. We are unable to assist you with this particular problem.

I bought sim-free unlocked iPhone 5s

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This case is a kind of unique case, I guess.

Pls help me. Could i get any service with my 1 month old iphone 5. My device can't recognize wifi devices.

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Welcome to the Apple Support Communities
Your log shows that graphic drivers have crashed, but there aren't any third-party extensions installed on your computer, so I suspect that there's a problem with the graphic card. I recommend you to take the Mac to an Apple Store to check if there's a hardware issue

HT1807 No service with foreign sim on unlocked iphone 4

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