Should I leave Bluetooth on all the time?

My parents just surprised me with my first car for my 16th birthday. It has the SYNC feature built in so that I can talk hands free if needed.
My iPhone 5s needs to be connected through Bluetooth for it to work. I was wondering if I should just leave Bluetooth on at all times, or turn it on when I get in the car and off when I get out?
Does leaving it on all the time drain battery?

Which iphone ios is the latest with NO CLOUD?

I have an iPhone 4S. It will be my last one because Apple is putting everyone's personal contacts on the iCloud if the ios is too new/ updated.

Which version of iOS may I update to without having my personal contacts on their unwanted cloud?

What is iphone apps made on xcode written in?

I'm new to xcode and i was wondering what coding langue is used to make iphone apps and also if you know any good websites to learn the language on thank you in advance to any answers

Power button hanging up? (IPhone 4s)?

My phone recently had an update and afterwards, everything on my phone was gone. Before the update I could usually lock my phone during a phone call & not Hang up, but now the power button just hangs up, can I change this?

Can Apple swap my iPhone 5C even if there's a crack?

I have an iPhone 5c that has the manufacturer warranty. My phone has been crashing/freezing and restarting itself like 1-2 a day.
The reason I ask, my phone was dropped months ago and has a small crack on the top left corner. It doesn't interfere with the compatibility. My crashing/freezing issues occurred before the drop anyway.

So could apple swap my phone even if it has a crack?

What is the iphone warranty protection plan (a2)?

Why do I have it? I bought my iphone off of amazon used and I went into apple to get my sleep button replaced for free but on the receipt it says I have protection plan a2? But when I checked the website for my warranty status with my original iphone serial number it says my "serial number has been replaced." I'm using a lender right now until they fix my phone…

IPhone 4s Screen Black

I had my iPhone in my pocket and then I took it out too look at the screen and then it was black but the battery was at almost 80%. Its been on the charger for the last hour now and won't do anything. The Lock button also on my phone is broken.

I want to make a i os game with code?

I really want to make a game for mobile devices like iPhone. I now you have to use code and i need to know what coding language is best for this and if i want to use something like corona SDK. I'm aslo using a mac if that makes a difference

Posting gifs with audio on Instagram?

I have a gif on my iPhone and is there an app wher I can add audio and post it on Instagram without paying? I have gifboom but it doesn't allow you to keep the audio when you jump to instagram