Yes its quite a handy thing, the kids can watch TV/ play games on their ipads on one wifi router, rather than using up data on their phones. I have a really good deal on my sims for work through EE now, but before that I was using Mobi Data the deal used to be twice as much data for the first three month s but that deal is long gone. You can also buy a PAYGO sim full of data on EBAY/amazon ideal for holidays and so forth, it lasts a year providing you dont use all the data before the year is out. Its a bit like being at home with a router. Depends on the data package you have on your phones of course if its an advantage or not