Why does this keep happening to me?

Okay so I've been noticing for the past few hours that whenever I go onto instagram and try and watch a video and I press play for the video, the video plays, but there isn't any sound. It has the bar thing in the top left corner when there isn't any sound. I have to switch the ringer back and forth for the sound to come on for that video only and if I want to watch another video, I have to do it again. I've only had this phone for a few months. It's an iPhone 5c. Is it a glitch with instagram? What do you think the problem is? This only is an issue with instragram. If I listen to music thru the music app or youtube, it's completely fine. So answer this: do you know any reasons why it could be happening and how do I fix it? Thanks.

by the way I tried using headphones to see if it worked but it didn't:/

IPhone 6 and Apple Pay - Will it replace all my cards if I want it to?

I have too many cards. Bank cards, credit cards, loyalty cards, fuel cards, coffee cards, work cards you name it.

Will Apply Pay on the iPhone 6 allow me to put all these different cards onto my iPhone and select between them when I make payments, or is Apple Pay just their own payment system and in other words yet another card albeit a phone sized one?

I'd love a device where I can store my cards virtually on a smartphone just so I don't have to carry the cards with me. I would then be able to use the phone as my debit card and to collect loyalty cards points at the same time for example when shopping in a store with a loyalty scheme.

Does Apple Pay work like this or is it just it's own separate system?

Added (1). E.g. Here in the UK I may wish to pay for products in Boots using my debit card and collect loyalty points on my Advantage card at the same time both separate cards.

At Sainsburys or BP Petrol station to pay with Debit card and collect points on my Nectar Card,

And so on. You get the picture.

So are you saying iPhone 6 and Apply Pay will allow me store store my Nectar Card and Advantage Card on Apple Pay and an iPhone 6 or not?

Cards add up when each establishment has their own one.

Are glass screen protectors bad for your eyes?

About 4 months ago I smashed the screen on my iohone 5 and the guy in the shop who replaced my screen suggested that I get a glass screen protector as it's the best thing to stop the screen smashing again. It's really thick, so thick that the button at the bottom isn't flat to the phone like on an iPhone without screen protector, you can feel where the glass is thicker on the surface. However it seems to have polarised my display and seems to have a flickery display? I got used to it after a couple days but whenever anyone looks at my phone they ask me what's wrong with it because it flickers? I don't notice it anymore. But my friend warned me it could ruin my eyesight. I don't know if it's the screen protector doing this though or that the man messed up my new screen and that's what's flickering. Anyone know the answer as to whether it's bad for my eyes?

Send and receive iMessages on the iPhone 5C?

Can you send and receive iMessages on the iPhone 5C?

Added (1). I'm getting an iPhone 5C soon and I would like to know if I can send and receive iMessages on it. I know the Messages program is for text messages, but I do not know if iMessages can be sent and received as well.

How to delete ringtones on your iPhone from the phone itself?

I've tried hooking up my phone to my computer to delete it that way but my computer won't connect to my phone for some reason. I just want to know if there's a way to delete ringtones that are on my phone FROM MY PHONE WITHOUT CONNECTING IT TO THE COMPUTER. If you're going to tell me to connect my phone to the computer, please read what I wrote in the first sentence.

Can you use a locked iPhone 5 normally?

I'm planning on buying a locked IPhone 5, can I use it normally? Like, I don't want to buy a plan on it or anything. I just want to use the apps and music, that's it. Do I have to unlock the phone or will I be able to use it without unlocking it?

Random voicemail message from no called id (iphone)?

I just got a random voicemail from an no caller id. He or she knew my name. He or she said 'hey poppy, I'm ( can't remember the name), i like your pictures! You so sexy bae'.

I'm scared because, i don't know who teis person is!

Some apps won't update/work on iPhone 6?

I just bought an iPhone 6, but now some apps won't work (such as Spotify and Shazam) and when I try to update them, it won't update. Can someone please help?