John and James were sat on the beach one day comparing their mobile phones. The transmitter for their phone company was centred on the middle of their little island. "My phone can get a signal even when I'm on the beach" boasted John. "That's nothing" said James "My phone can get a signal when I'm half way past the bay". As they were talking Jim walked past which his MUCH older mobile phone, and claimed he could go right into the middle of the sea and still get a signal. Scoffing at the idea, John told Jim to go out to sea and call him when he got there. So Jim went out on his boat. About an hour past before John's ringtone went off. Sure enough it was Jim. "Hi John, I've got some good news and some bad news. The good news is the phone does work. The bad news is this is a collect call".