A latest phone network is presenting SIM cards that will attach to whatever UK network is offering the sturdy signal, out of the main networks. Anywhere SIM is a Mobile Virtual Network Operator (MVNO) and the means it works is by using a smart ambiguity in roaming rules.
The network is an MVNO under Manx telecom in the Isle of Man, and Manx has a roaming conformity with O2, EE and Vodafone.
This means that when you're on the mainland with Manx - and currently - you're officially roaming. But it means your cell phone will attach to one of the three networks, quite than just the one.
Price-wise, the network resonances as while it may helpful. On Pay, calls are 10p/minute, and if you go for the "Anywhere Home" package, it falls it downward to 5p/minute, with 5p per text or MB of data. You can also apply it to roam in up to 30 countries - and if you depart for this package calls cost 12p/minute, with texts at 5p and a MB of data at 10p. So possibly not the finest choice for control users .