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Originally Posted by bkspero
One other issue. About the IoM roaming card. Sorry to show my ignorance, but does IoM stand for Isle of Mann? If so, are those the 0044 cards? Any other brand names?
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GT-Sim is the other main Isle of Man provider (both 0044 and GT-sim use technology provided by Callkey). One major disadvantage of GT-sim for you is the incoming calls are free in only one country (the country you pick for billing).
Callback providers rates to international sims are the same as to the domestic mobile of that country, i.e. for the Isle of Man ones look at the rates for UK mobiles, for United Mobile it's Liechtenstein mobiles, 09 is Iceland mobiles etc.
This is where 09 (Iceland) is quite good - several callback companies still offer calls from Iceland mobiles to US/UK in the 10-15c/min range (Callbackworld, Enlinea, gphone). So if you're in a country where they have free incoming, you can trigger a callback and then make calls cheaply, but of course it's expensive for other European to call your Iceland mobile.
This is where VOIP comes in. You set up a voip account that can be easily forwarded and that has an incoming number in a major country that is cheap to call (US, UK). You then point that to your Cz mobile while in Cz, your other roaming sim when out the country so you are easy to reach. But that's really only if you need to be easy to reach for business purposes - for general use it's overkill.