Hong Kong - Ireland Customs charges and other charges I might face?

Okay so basically I own an iphone repair shop. Currently buying them from a supplier and reselling. I recently came across a legit supplier in Hong Kong and i think its time to cut out the middle man. Please don't tell me to contact apple, I don't need 500 phones at once! Haha. And this company is totally safe, they buy them, refurb and sell.

Basically I'm interested to know after I pay for the items (first test order for x5 devices) and they are shipped by FedEx Int'l Priority (3 days); will I encounter other problems? VAT, Custom Duties, Custom charges etc?

Also could you tell me because I'm confused, if I buy within EU are phones Duty free? Would it be better to buy within Europe?

Any advice or views on the best and cheapest thing to do would be appreciated!

He sent me a blank text message?

My friend sent a message but it was blank. I have an iPhone & he doesn't. So mine shows a blank bubble. It looks like it can fit maybe 2 letters in it. Or a symbol? I don't know. Does this mean he sent an empty message? Or?

IPhone border and sticker app?

So on Instagram I've seen a few pictures with borders of like flowers or galaxies or even ufos. And then other times I've seen pictures with stickers saying things like "stay rad". And I was really really wanting to edit my pictures like that. What are the apps called?

My iphone 5c always randomly resets itself?

It will restart itself sometimes when i'm snapchatting, playing video games, etc… It most recently happened while i was listening to music while skating… Please help… I'm worried… Lol

Is there an app for Apple that allows you to text and send pictures from that texting number?

I have a iPhone 5s and I want to find an app that I can text or call people and when I send pictures it sends the picture from the number that they gave me instead of a link or and email?

Example: If a texting app gives me the number (555)555-5555 and I send I picture to someone I want the person I sent the picture to, to receive it from the number I got (555)555-5555 not a email.

Hopefully that made sense if know of any apps that do this please let me know!