Hey man its good to be suspicious, you don't get anything for nothing in this world, but in this case you do, its the companies who pay, but no Michelin, I am with you there, sunshine all the way, i like to come back with my Le Mans Burn, no matter how much cream i put on or how much shade i sit in a always get the burn.
Sorry i digress, currently we only link through the UK networks, so all UK mobiles are free, as for how much it would cost to receive on a German network, at this time, not work time, in the evening i could not give you an honest answer, i will look into it for you and let you know. I should imagine you would get charged you normal SMS text rate no more, as this is just a standard text message, not premium rate. So whatever that is from free to 5p(or euro equivilant) tp 10p. Worst case is 24 times 10p. But let me check that for you as i don't want to be responsible for a huge phone bill next month
If you do want to sign up though anbd are non UK, rememebr to put your country code on the sign up, ie +44 for us in blighty!