Hi all, I have an iPhone 6 plus on Vodafone UK. I've had it more than 12 months. I am soon to travel to the USA. Vodafone charge roaming fees for international use. However I have a three UK sim card for an iPhone 5 which gives me their 'feel at home' deal which will allow free roaming in the USA. If I get my iPhone 6 plus unlocked by Vodafone will using the three sim card in it cause me any problems? I would anticipate using the three sim card almost all the time I'm in the USA but then once a day swapping the sims over so I can pick up messages on my Vodafone number. Can anyone see if this will cause any problems? Any issues with different sims in the same phone swapping back and forward?