We bought our 2 boys Smart Watches for Christmas, but didn't realise they had a sim card slot. They have their phones with 3 who i understand don't do a duplicate sim with the same number.
Are we supposed to gt another sim with a different number to run on the smart watches or switch the sim from the phone all the time?
You would have to get a different sim as it is a different device, like you would have to with a cellular tablet. You would also have to ensure the watch is compatible with UK networks. I had a sim in my old SmartWatch that wasn't UK compatible but could be used when I went to Romania, awesome to use.