Arrived OK prompts

Without any need for SMS, phones on international roaming, scampering for a public phone, one can inform friends about arriving at one's destination safely.

This isn't one of those automatic prompts from airlines that announce that the plane has landed. The service works by checking whether one's phone is actually working in the destination and then sends out SMS, email, twitter to the pre-set list of people. ArrivedOK seems interesting. Hope it works!