I'm going to be living in France later this year from late August through December. I currently have a new iPhone XR that I bought through T-Mobile in the US, so it's locked. Is it possible to get T-Mobile to unlock it for me before then or no? If not, I was looking at the Apple clearance site iPhone SE's as a relatively inexpensive backup that I could get and use with a French carrier SIM card. Is this a good idea? Thanks