Gave them a try as well. I only used them temporarily to place international calls but the one time that I did it whle driving I didn't see any difference with the T-Mobile service. So far,
- Call quality to landlines in Europe was excellent.
- Call quality to cell phones in Europe was decent. On a single incidence the volume was too loud and it distorted. I don't think this was Lycamobile's problem.
- I can't get the online recharge to work. I enter all my info and at the end I get the message the transaction failed. I see the temporary authorization on my credit card, and it later goes away. I was only able to add credit by going to a local cell phone store.
- Customer service is in India. They are not allowed to request credit card information, so they couldn't do the recharge.
- Online customer service only got me the autorespond email and nothing after that.
- Calls (pay as you go) are charged at 20+ seconds longer than the call as timed by the phone itself.
- The sim card doesn't have the APN info for data. I didn't want to use data, so I didn't enter an APN.
- International roaming in Europe worked fine and at 46¢/min it beats AT&T and T-Mobile's $1.29, $1.39 or $1.79, and matches what European pay as you go carriers charge when roaming within Europe.
Given that I couldn't get any credit card to process on their website, I couldn't buy a sim card from their website either. One store sold them for $10, another for $5, and they go for 99¢ on eBay.
I think I'm going to try h2o next. Their $49/mo plans are very comparable: unlimited voice, domestic and international texts, 1GB data. Lycamoble gives $20 credit for international calls (1¢/min land-8¢/min cell in Europe) whereas h2o has unlimited landline (certain countries) and gives $40 credit for 20-30¢/min (in Europe) calls to cell phones. h2o also has mms but doesn't roam internationally.