Originally Posted by
Dubai Stu
Verizon uses both CDMA and LTE and would support quad band HSPA. My recollection was a Sprint unlocked phone was the most versatile. I am going to go on a limb, however, and say that you want at least a 6. WiFi calling really isn't supported before that. In theory the iPhone 5s supports it, but there is a reason why most carriers have avoided it on that phone.
Depends on the model you get. The 6s model for Sprint/T-mo/Verizon is the same. AT&T model adds band 30 support, which I think is only used in the US.
http://www.apple.com/iphone/LTE/
Originally Posted by
zcarenow
thanks. tmobile did tell me about free wifi calling when i travel abroad.
I think all the carriers offer that nowadays. Verizon, AT&T, Tmo do...not sure about Sprint.