A quick search on Google will tell you all you need to know about mobile phones for you to do your own homework. For example, it gives: http://www.kelkoo.co.uk/b/a/co_1625-mobile-phone-guide-buyers-guides-to-mobi le-phones.html Will your phone work in Poland? Depends on what sort of phone you bought in the US. -- GSM: The Global System for Mobile Communications uses three frequencies for phones, 900MHz, 1800MHz and 1900 MHz. A dual-band phone will work on two out of three frequencies (900MHz and 1900MHz). These are the frequencies used in Europe, Asia and most other places except the United States (which uses 1800MHz). A tri-band phone will operate on all three frequencies and therefore, in theory, will work anywhere in the world. -- Roaming: Roaming allows you to use your phone abroad on other networks. You will need to be authorised to use roaming by your provider and not all of the services you have in your home country may be available. Generally, text messaging is permitted but voice calls may be restricted to the country you are in unless you have full roaming. If you have a spare tri-band phone, take thet with you and purchse a local pay-as-you go SIMM card in Poland. Use that for local calls [calls in Poland]. Use your other triband phone to call back home to the US. No ti-band phone? Tough - that's what comes of the US authorities never believing that the original 11 European GSM MOU countries would agree a common digital mobile standard back in the 1980s. C'est la vie. Best regards David