Originally Posted by Pondering
Thanks for the responses. Travel will begin in August, possibly sooner. Trying to research prepaid carriers now in all three countries, but am getting so much commercial "noise" in my search returns so its hard tease out local specs as to what GSM freqs I'll need.
Europe is easy: all GSM (2G) will be either 900 or 1800 (many networks have both), and 3G (UMTS, aka WCDMA) is 2100. That's it - cover those and you're good (unless you want LTE as well, in which case the only UK coverage currently is in the 1800 band, but limited to a number of large cities and grossly overpriced - not sure what will change by time you travel. Don't know about Greece).