Yes. If you purchase an unlocked iPhone - that is, an iPhone that is not locked to a particular wireless carrier - you can insert the SIM card and it will work in the country where it was sold.
However, until the iPhone 8 is released, there is no way of knowing what you'll be able to do with a SIM card on it.
I am currently on AT&T on an iPhone 7 Plus 256GB, and for my next iPhone, I would want Verizon, and want it to ship on release date. But there will be no SIM free option, just like when the iPhone 7 was released in September. But when I preorder it several minutes late, then I would end up losing the iPhone because I may need to wait until 2018 to just get it. I am going to switch to Verizon this October.
All Verizon phones are sold unlocked. They have been since the iPhone 5. So if you order a Verizon iPhone 8 it will be unlocked out of the box.
You cannot switch an AT&T iPhone 7 Plus to Verizon; Verizon will not accept it. Note that the 7 and 7+ come in 2 models, one for GSM only and one for GSM and CDMA. The GSM/CDMA phone only comes for Verizon and Sprint activation.
Yes, I know all of these. I am rush buying and I really wanted CDMA because I am getting really bad coverage in AT&T and I compared it with a Verizon iPhone 7, Verizon Wireless is way faster in my area. I have been using AT&T since the iPhone 2G in 2007. That was on AT&T and since network shutdown, the SIM is still in there.
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But will AT&T, Sprint, T-Mobile iPhones come unlocked, or locked if I pay in full?
All Verizon LTE capable phones are GSM unlocked out of the box. Your AT&T iPhone 7+ will NOT work on Verizon or Sprint. It is not compatible with CDMA carriers.
We don't know about the next model phones but the current models can be purchased unlocked. But if you are thinking of switching to Verizon do not do so, they will not work with them.
Is it possible to put a Verizon SIM on a SIM free iPhone?
