I agree with Kalico above:
Cosmote is probably the best mobile internet for USB dongles.
I was in a place, and couldn't find the Cosmote or Germanos shop, so went Vodaphone.
Here is my experience so far:
Initial setup was more expensive (€50 for dongle + 2G/20day data).
Top ups were also more expensive (€20 for 2G/20day data).
However, the 20 days versus Cosmote 10 days justified it for me. (ie: I find I usually run out of time before I run out of data)
Why they put such aggressive time limits on such a small data cap is crazy...
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Anyway, just noticed today a summer offer on their website:
K????Internet | Internet ?? ????? Vodafone ?????Internet - Vodafone.gr
New users Vodafone KartoInternet
-> Promo pack & USB modem -
35 €
A USB wireless access modem K3770 which allows for connection speeds up to 7.2 Mbps, SIM Card, Free access to the Internet for 15 days.
-> Owners of a USB modem
devicekartointernet Connection pack -
15 €
Select this pack if you already have a wireless modem and do not need additional equipment. The pack includes: SIM card, Free access to the Internet for 15 days!
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Hahaha... I love this "free access to the internet for 15 days"... WTH? I just paid you €15... so why is it free?
Anyway, so the €35 USB modem + 15day internet is pretty competitive.
Not sure how many Gigabytes they are allowing in 15days... hopefully 2Gigs.
Will let you know when/if I top up again.
The coverage has been good. There has only been one place that wasn't 3G. (Note: Cosmote had 3G in that location).
I've only run Speedtest on it twice: average is ~3M down, 0.75M up, 160ms ping.
Yeah.. stay away from WIND if you want 3G. Wind's data is the cheapest.... I have it on my phone... but very rare to get 3G. And honestly... GPRS (2.5G) is so slow: 57k down, 28k up. The Facebook app barely works on GPRS. Ok for email though, and "always on" data. But would be useless on an ipad or USB dongle, etc.
Hope this helps.