I've had dual sim samsung phones for years, mainly as where my other half lives there is no Vodaphone signal, so I have an EE sim only contract as I used to spend every weekend over there, and needed to be able to be contacted in case of emergency, I now have it set so that if There is no signal on my primary Vodaphone no, it automatically rings the EE no, Very use full when you are a self employed tradesman and need to be contactable for emergencies. The only downside was that they were not available in the UK, so I had to buy my own phone from abroad, but I see some of the newer phones are now dual sim anyway, as the other half got a new samsung on contract and it is dual sim.