Iphone rear camera stopped working?

I was trying to get a photo of this candle on snapchat with this filter and all of a sudden the app just froze and so i re freshed it and now my back camera isn't working. Whenever i try to take a photo with the back camera the app freezes. My camera is working on the camera app nor snapchat, i've tried to turn the phone on and off and delete the app! I don't know if its because maybe the camera got too close to the candle but fml lmao help please

Should I get an iPhone 6? - 1

I'm 15 and have never had a cell phone before. I know that the iPhone 6 (not the 6s, just the 6) is getting old but I really do need a phone now since I'm out a lot and need to be in contact with people for safety and social reasons. My family doesn't have a ton of money but I don't want an Android (since if I did get an Android, we'd be looking within the same price range and it wouldn't be very good)
Does anyone still have the iPhone 6? How is is working for you?

IPhone 8 battery swelling

So I just got the iPhone 8 and first thing I read when I activate my phone all happy is a report of swollen batteries is this a hoax or is it true? And if it's true can I use my device while charging? I just paid 800 for a device I don't want to have to get a new one

Iphone 4s Text Messaging Problem?

I have a work friend who I recently got their cell phone number but when I went to text them a message came up on my phone saying it couldn't be delivered. I tried sending it again and the same thing happened. After that I deleted their contact info and re entered the number to see if it would help. But after doing that things still did not work.

I happen to have another work friend who also texts the same person. I checked with them to see if their messages were going through and they said the number was working for them. The phone this person uses is an android.

I can text any other contact on my phone and the messages will send without a problem this is the only one I seem to not be able to use.

If anyone has some suggestions on how I can fix this then please let me know.