Replacing the Back Housing of IPhone 5s. Possible Services?

I want to replace the rear housing of my new iPhone 5s. It isn't broken, but I really would like a different color backplate. I know about the do-it-yourself kits available online, but I'd prefer a more experienced technical professional. What kinds of services could I contact for help with this?

Do I need a new sim card for an iPhone 6?

I current, y have a normal sized sim card which I attempted to trim some of the plastic off, but still doesn't fit.

Do I need s new sim card or can someone with a special tool be able to cut it?

I have iPhone 6 Plus Jailbroken on 9.0.2. I wish to restore my phone and remove everything on it?

I have iPhone 6 Plus Jailbroken on 9.0.2. I wish to restore my phone to factory settings and remove everything on it because I'm giving my phone to my wife. I wish to retain my jailbreak though. If I'll restore my phone and remove everything will i have to reactivate the phone with Apple? If yes will activation happen even though Apple has stopped signing the iOS version?

What options do I have?

Why do the children of this generation act so grown up?

I was scrolling through Instagram and I was seeing a lot of "what I got for Christmas" posts and a lot of them were children with iPhones and laptops and things like that? What happened to kids getting toys for Christmas? My little sister is 7 and asked for an iPhone 6 and she didn't even want any dolls or anything like that. It makes me sad. I mean I'm only 20 but when I was a kid, all the cool electronic things were just coming out but they were mostly for adults and teenagers. Not children. I just miss the days when children wanted childlike things for Christmas instead of iphones and designer handbags.