3 devices, an iPhone 5, an iPhone 6, and an iPad Mini. All have the same iCloud account logged in on them. All have a SIM card in them - One has a Vodafone Australia SIM, the other two EE UK. The iPhone 5 is sitting in Australia, connected to power, Vodafone and the internet via wireless. The other two are in my pocket, on the other side of the world. If someone texts my Australian number, will it be received by the iPhone 5, and then sent via WiFi to the iPhone 6 and iPad which are on the other side of the world? If so, and I reply from the UK, will it reply using the UK number or the Australian number?