Hello Amey, There are 3 companies. 1. Wind (it costs 29.90E per modem+SIM and you have 30days internet. They describe 30 days=3GB) http://www.wind.gr/en/for-individual/mobile/wind-mobile-broadband/mobile-bro... 2. Vodafone (it costs 50E per modem+SIM and you have 30 days internet) http://www.vodafone.gr/portal/client/cms/viewCmsPage.action?pageId=8638&request_locale=en&lang=en_EN 3. Cosmote http://www.cosmote.gr/cosmoportal/page/HCG/section/IOTG_onRequest_prs/loc/en... choose the second (you'll have 40E to spend=5GB) http://www.cosmote.gr/cosmoportal/page/HCP/xml/Personal__contractplans__cont... You choose what you prefer best. If you have the USB modem, you can by only the SIM card (which is cheaper of course). DOCUMENTS Usually they need your passport-id. ACTIVATION: Usually it's activated after you leave the store. Didn't buy all those 3 to know the differences. So you have to ask them. You can purchase the sim in Athens and use it anywhere without any charges-changes. There's no wi-fi available in the city buses (there's no train in Thessaloniki). Don't know about Athens. I think it's available at subway stations. Let us know if you need more info. Have phun, Stathis Στις 07/07/2013 06:27 μμ, ο/η sco1984@gmail.com έγραψε:

Hello,

Pls recommend cellular provider which offers cheapest prepaid data/internet plan in Thessaloniki. [ I am ok with non 3g/4g data plan too. ]

And, 1) what documents they need? 2) When sim gets activated? [ 2 hours etc ]

If I purchase sim in Athens & use in Thessaloniki, are their any roaming changes?

Wi-fi available in city buses/trains?

Regards, Amey.

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