I was wondering if I can simply insert a European carrier SIM in the iphone to use it in Europe.
I have done this in the past with my blackberry by first calling Tmobile to have them "unlock" my phone for use with another carrier's SIM. wondering if I can do the same with AT&T.
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Simply insert your SIM card into your iPhone (with respective carrier IE AT&T in an AT&T iPhone or activate a Verizon iPhone 4/4S on Verizon with a clean ESN). You may need to contact your respective carrier to validate a data plan in order for the iPhone to function properly with data and visual voicemail.
The only thing that you must have is a SIM eject tool or simply a straightened paper clip or any pin-like object hard enough to push-open the SIM tray. BTW, this SIM eject tool came with the box when you bought your iPhone.
Here are the steps:
First, refer to the image below to locate the SIM card tray. To pull it out, you need to insert the SIM eject tool (or the paper clip) on the tiny hole on the top of the iPhone 3G or on the right-side of the iPhone 4. Push until the tray pops out.
NOTE: The tiny hole found on the top of the iPhone 4 is not for the SIM card tray, it is a microprhone. Please do not insert any thing in there.
Once the tray pops out, pull it out completely and replace the SIM with any SIM you want.
When you're putting it back make sure that the SIM carrier logo is facing the front of the iPhone. Don't force it if it get stuck, just pull it out again, and gently put it back.
If you bought your iPhone from someone instead of an official reseller such as Apple Stores and Apple's partners around the world, this could mean that your iPhone was unlocked through a jailbreak and once you upgrade the firmware you lost your jailbreak and your unlock. This means you'll have to jailbreak and apply an unlock so you can use your SIM card. I suggest you take a look at blog.iphone-dev.org and iclarified.com and look for tutorials on iPhone.
First, if your iPhone is carrier locked (as most iPhones are), you can only use a SIM card from the same carrier -- if you purchased a subsidized iPhone from AT&T, you can only use SIM cards from AT&T, for example.
If your phone is in a case, remove the case. Power off your phone by pressing the power button for several seconds and confirming the power off operation when the on-screen prompt appears.
On the top of the phone, just to the right of the headphone jack, is a small hole. Gently insert an unfolded paper clip or a short piece of thin wire into the hole and press the SIM release button. The SIM tray should pop out. Carefully remove the SIM tray, replace the SIM card and re-insert the SIM tray.
Now you should be able to power your phone back on and use your new SIM card.
do as it says you need a valid SIM to restore an iphone and it is possible to have a SIM go bad. There is nothing that can be done until your sim is infact working and valid and it MUST be an AT&T sim no other sim will work for restore.
You'll need to buy and insert an adapter such as this one. (13th item down the page).
No soldering or cutting needed as it simply repaces your current SIM card, but note that like ALL current twin SIM adapters it might not work fully if you own a UK or European version of the iPhone 3G.
Hope this helps, if so please return the favour and take a moment to rate my answer.
Any SIM card that is activated (not expired or cancelled) by the issuing carrier should work, assuming that your Samsung phone operates on the correct frequencies for the country you are in.
You need three things to be true for all this to work.
Your phone must be unlocked. (You have this one OK)
Phone must work on the frequencies for your country (I don't think your Samsung covers European frequencies, from the web sites I checked)
You must have a valid SIM card, either prepaid or on a billing contract
Having said that, the price charged for your calls will vary widely from carrier to carrier. For occasional use, the cheapest thing to do is to buy a prepaid SIM that is issued in the country you are in. I would NEVER take a US SIM card to Europe and use it there unless (a) price was no object; or (b) I absolutely HAD to be reachable by others using my US phone number.