Dolphins in South Africa are being issued with mobile phone technology. But they won't be talking or SMSing each other. Instead they are being fitted with collars containing SIM cards to keep track of their movements. Researchers just need to send a text to find out the dolphin's location. The creatures swim close to the shore so they'll be able to pick up the signal. The system has been already used to track 200 animals in Africa, including elephants, zebras and baboons. SIM card technology is becoming popular in tracking animals as it's cheaper than using a satellite system.