When my wife passed on I got her iPhone. Been trying to figure what model it is, was told by a friend it's either a 7plus or an 8plus. How do I tell the difference? I know I'll have to go to the store to get it set up, been thinking about doing that as the quality is so much better than my Samsung Rugby Pro. Only thing is it won't fit in my shirt pocket. Appreciate any advice or pointers. GW