YES it should although if its jailbroken/unlocked it will lock
yes. once an iphone is universally unlocked it will work.
Yes
no unless it is unlocked... .
ALL mobile phones have a SIM card - unless they're sold 'unlocked' in which case they're SIM free. If Boost is selling the Samsung seek - it will have their SIM card in it unless they're selling it unlocked (highly unlikely !)
yes you can if ur iphone is unlocked you may have a choice of any sort of simcard but if its locked you can only have that type of simcard
An Apple iPhone 3GS can be purcased unlocked without a SIM card and used with a local carrier's SIM card. Once purchased it is as simple as inserting a SIM card from the carrier of your choice.
I have an unlocked Blackberry 9670. Can I purchase a boost sim card and use it in that phone.
Assuming the SIM card is the correct size for the iPhone (ie not a micro SIM) - there's no reason why not. Since you say it's unlocked - it should accept any networks SIM card.
If the Galaxy handset has been unlocked - yes.
In theory, yes. T-Mobile is actually the carrier for the iPhone in Germany. Keep in mind, however, that unlocking an iPhone completely voids its warranty, and if anything happens to it, the only recourse is to purchase a new iPhone. Apple will not service a broken iPhone if it is unlocked.
No You Cannot As Of Yet. I just tried it on an unlocked 3G Iphone 16 gig.
Yes. Unlocked iPhones do work on the Orange network in Israel. One just needs an appropriate 3G sim card.