Where to get an iphone fixed in Shanghai?

I live in Shanghai and I have an iphone 4s that keeps randomly turning off. Off recommendation from a friend, i went to Metro City and had a guy at a booth there look at it/fix it. Basically, he did a terrible job- I paid him to replace the battery and motherboard, but when the problem continued to persist, I discovered he had done neither.
I returned with my receipt, and he refused to fix the phone without charging again. I called the police, and long story short, the battery is fixed but the phone is still randomly turning off.

Yesterday, my phone turned off and will not turn back on. I do not want to hassle with this guy again- or any vendor in which I would have to bargain- so does anyone know a trustworthy place where I can go get my phone looked at and fixed in shanghai?

I tried to set up with the apple store, but all three stores do not have appointment times available, and I do not want to buy them from scalpers. I have business to attend to, so not having a phone is extremely difficult- the faster the better!

How often should I charge my iPhone?

So I just got an iPhone, and in the past I have had troubles with battery life on some of my androids. So I have a few questions:

1) at what percentage should I charge
2) until what percentage should I charge
3) am I supposed to fully discharge it and fully recharge it

I want to upgrade. T-Mobile?

I have a Galaxy S3, I reeeealallly want the iPhone 5S but I'm on a family plan with my mom. Could I like get an upgrade when I'm on the plan?
I was just gonna sell my phone on Craigslist for an AT&T iPhone 5s but if it breaks or gets damage l can't take it to the store because they'll ask didn't I have a galaxy S3. What can I do?

IPhone 4S to 5s and keep the same number?

I'm currently a vodaphone customer with an iphone 4s wanting to upgrade to the 5s, when I upgrade online and the phone gets sent to me will the 5s nano sim have the same number as my current iphone or will my number change?

Tmobile iphone on metro pcs?

Recently i just read that tmo and metro had joined forces… Just like simple mobile… My question is will my locked phone work on the new metro pcs. Network, i'm wondering since simple mobile used to work on my locked tmobile iphone 5, and since metro and tmbile are together… Will it work?

Iphone 4s: how to put photos on camera roll?

I need help. Seriously. My mom needs me to figure out how to save all her photos to my computer, in case she loses her iPhone. Again.

She did all the iCloud stuff, all the backing up stuff and everything, and put all the photos she has on her Camera Roll onto my computer.

The problem? There are photos NOT on Camera Roll, thus can't be put onto my computer.

733 photos ARE in her Camera Roll, while 468 of them are NOT.

What happened was, my mom's friend put those photos onto her iPhone 4s from a USB, but those photos were not put onto my mom's Camera Roll, but on a separate album-folder thingy. It seems I can only import photos from her Camera Roll, I need to put those photos there to put it on my computer. I told my mom she can just ask her friend to do all that fancy computer stuff, but apparently he moved back to China and whatnot.

So basically, to put my mom's photos onto my computer, I figured I need to put them onto her Camera Roll, but to do that it needs to be in her Camera Roll for it to be access on my computer.

Its a cruel cycle, I know. So anyone knows how to fix this? Anyone know how to put it all onto my computer, or put the photos onto her Camera Roll?

Thanks. I'll give a thumbs up for any and all answer attempts.