Does spotify allow you to use it on many devices?

I know Spotify is £10 (Rounded up) however I don't want to be paying this much on my own. There's many of us in the house all with IPhone so I was wondering, If I was to share the cost with my dad (£5 each) on one of our bank cards (Most likely mine. ) will we all be able to use it. For example we have Netflix and we have it on the PS4's and TV's but we can only have it on five devices and only two can be playing at once. Can this been done with Spotify? For example, on my phone and on his? Also, if this can be done, I know the premium you can go offline mode if I'm correct? So say if I was to have loads of playlists on offline mode, can I listen to these whenever I want and wherever I want and 1) Will it use any data and 2) if I listen to this offline, can my dad listen to Spotify by streaming the music?

Or even better (Most likely not possible though) can we both have music saved offline then listen to what we want whenever we want?

Only need to know because I would use it a lot and my dad will listen to it a lot as well so need a way we can both be using it…

(I would rather save the music offline mode as I have 1GB data and he has unlimited(The a**e haha.

Thanks for your time and please can you make the answers as clear and easy to understand as possible please…

Not displaying caller ID (iPhone 5)?

There's a feature on the iPhone 5 where you can choose to not show your caller ID when making a call. Would that reflect on the call logs on the phone bill? Will it not register in the history?

How does iCloud and photo stream work?

I had an iPhone 4 and never downloaded the iCloud control panel to my computer (I have a PC) so I never really cared but I noticed that i had the ability to keep 1000 photos on my phone, anymore than that then the phone would delete a photo to make room for another one that I took. Well I got an iPhone 5s and downloaded the control panel and was just wondering how many photos I could keep if I always keep the photo stream backed up on my computer? Will my computer only keep 1000 as well? I have them set up to automatically save to the computer through the control panel but do I have to constantly connect my phone to make sure they are getting saved or will they go away after 30 days if I don't connect my phone. I know this kinda seems like a dumb series of questions but I just don't know and my usual tech guide is currently in bootcamp.

Just got iphone 5c a month ago, battery draining fast?

So this is my first iphone and I really like it, but the last couple of days the battery is just draining ridiculously fast. I've read a ton of stuff online about it. At first it seemed fine, but for example yesterday I charged it to 100%, barely used it all day and it was down to about 60% after about 7 hours of essentially sitting in my pocket.

So I went online to find tips and turned basically a ton of stuff off, deleted facebook (just to see), turned brightness down, and then used it to about 3% and then charged it again to 100% before I went to sleep. Left it on my desk all night for about 6-7 hours and generally it only goes down a few percent or so but today it was down 22%! From just sitting there with the screen off. The only thing I keep on is Wi-Fi but I don't see how that could drain that much battery overnight. Any ideas or did I get a bad battery?

Siri vs Cortana.which is better?

I think that windows phone has finally reached a point where it can compete with Siri and even Google now.
I've used Cortana and Google now but as I have never used an iPhone. So will you please explain which personal assistant is better and why?(personally Cortana takes care of every query of mine).
Please give unbiased answers.