My brother is leaving for London tomorrow for 8 weeks. I advised him to just get a local SIM to pop into his iphone 6 (he's currently on Verizon). However, with the recent announcement that T-mobile will be giving free, unlimited high speed data to all their customers in Europe, do you think he should use a local sim, or pop in a T-mobile SIM. He wants to do some traveling around other European countries too. He wants plenty of data to update people on the go, won't be making a lot of phone calls, but probably could text a lot to friends back home. I don't know how the pricing structure works over there. Any suggestions? Thanks!