Make sure its jailbroke and you have the code to break out of your phone, else you gonna be buying one, but Android phones are fairly cheap in Ukraine. You can buy a decent one for $200 and get a plan for peanuts per month including data.
Depends on what you need it for. all you need is a quad band phone thats unlocked. Iphones can be done for free and most other phones can be done for less than 15$ on the internet. I first used a china phone I purchased on Ebay for $60 it held 2 sim cards. I just recently lost it but can use my Iphone since mine is unlocked and jail broke. You can check easyukraine tips page about phones.