GT-Sim
(+447924xxxxxx isle of man)
Atention, are not favorable for the Internet (0.01kb=0.015€) but GOOD for cheap phone calls, of 0.19€ Worldwide Landline and Worldwide Mobile of 0.29€ and SMS of 0.09€ EU, 0.29 World. Incomming Call 0.09€ EU and World 0.29€...see TarifPlan.
This is a Roaming SIM card with the most users, more than one million...
GT-Sim / PricePlan
I am satisfied with the GT-sim 4 years and phone tariffs are very stable for years
gt-sim there since 2006. It is very important for the stability!
Thanks GT-Sim
TipTop
My favorite sim and VoIP for roaming in Europe and worldwide:
UWT-mobile and Xxsim: for call+sms in Europa extern and Worldwide
ToggleMobile: for internet+call+sms only in EU intern
(VoIP/Sip) FriendCaller or SipCall.ch: Worldwide sms+call