I'm thinking of buying a Note 9 in the UK. I see that there is the option of a dual sim version. I've never considered one before - can anyone tell me what the advantages are please. I have had a Three SIM for many years which I find really useful for the using abroad function but my signal at home is not good and it may contribute to poor battery life on my current S9. If I switched to a different provider with a better signal as my main SIM could I use a Three SIM abroad still in the other slot? As you can see, I know very little about dual SIMs! Thanks for any help.