Sold a phone on CL. Man can't unlock it wants a refund

So I sold an iphone over CL. When the buyer contacted me I stated the phone carrier was AT&T. He wanted to switch companies. I told him it want unlocked but I'm sure he can have it unlocked. He stated that was fine and we completed the transaction. Later that evening I get a call from metro pcs stating I have to call AT&T for the unlock code. Well upon calling AT&T I find out you unlock the device through iTunes. I explained it to the man who bought the phone but he is insisting on a code, which I obviously can't give him. Now he says he wants a refund. My question is, is he entitled to a refund even tho I told him the phone was carrier locked and he knew there was a slight possibility it couldn't be unlocked? I never lied to him. The phone can be unlocked but he is refusing to do it the way I told him he needs to do it.

Replacement Pending iPhone. Replacement phone or fix?

My iphone is being repaired and on the apple service page it says 'iPhone replacement pending' and below it says repair complete…

I was wondering if this meant that my phone has been repaired or if Apple are sending a replacement iphone different than the original.

Should I start working out my upper body while lower recovers? Also what a good personal trainer app?

Basically I been working out like three times. I went to the gym and did some workouts at home with the Nike app. My legs and glutes are killing me. I should work on upper body for a while until my legs are better? In addition to Nike training club which personal trainer app is the best? I was thinking about getting an app called workout: gym personal trainer and workout tracker. It got five stars on the App Store for iPhone users.

Why does my camera look different?

I have an iPhone 5S. I smashed my phone screen so I took it to my local phone repair store to get it fixed. They say they replace the whole screen instead of just the glass (which is what most phone repairers do). They do this for £64.95 which includes a 12 month guarantee and a free screen protector. Since getting it fixed earlier today, my camera has looked grainier than before. Does anyone know why?

Instagram Windows 10 App?

I'm stuck with the iPhone 4, due to funds, so I primarily use the windows app for IG. Recently, I tried to use the disappearing for the first time in a while, but when I took a picture, the app crashed.

I tried uninstalling and re-installing the app, to no avail. I know it can work, because I've done it, it's just been a while.

Any advice on how to fix the problem?