What's the best way/time to factory reset my iphone?

I have an iPhone 5 and I updated to IOS7. Since the update my battery has been draining around 5% per minute that I use it. My brightness is perpetually on the lowest setting, I don't have bluetooth, air drop or notifications on. I don't use location services and I'm probably one of the most conservative people I know when it comes to my iPhone's battery. Will factory resetting restore my phone to IOS 6? And when is the best time to do so (eg. When the battery is at 1%, 50% or 100%)? Does that even matter? Thanks in advanced. It's really frustrating when my phone used to last anywhere from 12-16 hours and now only lasts 5-8 hours.

IPhone 4 needs Voicemail Password?

Just upgraded my iPhone 4 to iOS 7 and since doing so, a message will pop up every time I unlock the phone (and Cellular data is on) saying that I have the incorrect voicemail password. I've never made a voicemail password, and actually called my voicemail and gone with the option to delete my password which provided a half fix because this used to also happen at all times, but now, only when cellular data is on, any fixes to making it go away All the time?

Messages taking up memory on iPhone?

I have an iPhone 4S and I've recently just updated it to iOS 7.

A few days ago I was having a clear out on my iPhone and noticed that Messages is hogging 2.9GB of memory. When I tap "Messages" it says "Messages (Saved)" and I can't delete it. I can delete messages and conversations from within the app though.

But I can't understand why this is taking up 2.9GB! I never had this problem with iOS 6.

Any suggestions? Or has anyone else noticed this?

Thanks in advance.

Added (1). Also, to be clear, I don't think I've ever deleted an SMS or iMessage from my iPhone 4S since I first got in (back in August 2012) - could this be why? I've had a lot of media (images and videos) sent to and from my iMessage conversations over the year - maybe media has built up? Although I thought only the last 10 bits of media was temporarily saved on your device… Then deletes itself after a while?

Updating jailbroken iPhone 4s to iOS 7?

I would like to know an answer from someone who has tried it.
So I have an iPhone 4s which was jailbroken way before T-Mobile came out with iPhones. The iPhone 4s i have is Jailbroken to work with T-Mobile, but I haven't updated it ever since it was
jailbroken because I'm scared it'll messed up my phone. Can I update my phone now that T-mobile has iPhones in their company? Or do I have to directly get a new iPhone with a new sim card?
I don't want to try it out because i don't have the money for a new iPhone and jailbreaking it again will cost money because I don't know how to jailbreak a phone so that i'll work with a different phone company. I don't want to take my chances. So can anyone give me some type of answer? Is it safe to update even though its jailbroken to work with T-Mobile even before T-mobile had iPhones?

Will gta v come on App Store?

Will the actually game come on iPad and iPhone like they have gta vice city and librerty stories will gta v be on the App Store as well.

DO NOT DOWNLOAD hotspot shield?

This app is called hotspot shield and it is absolutly horrible! It tells you it will give you a 1 week free trial and then you have to pay. After my trial was up (which it did not work at all) it said i have to buy from their website or all my passwords would be unlocked.never on their website does it say how to delete the app all together from an iphone/ipod/ipad. What you have to do is go to settings-general-profile and then click remove, it seems simple but it took me a couple days to figure out. This app also made my internet run really slow or not at all and also sometimes did not let me log onto my gmail account.

Should I buy a gun before it's too late?

I'm a young adult male that is engaged to a beautiful woman. The only problems is that we're broke and trying our best to save every dollar. Do you think I should use the money that I was going to buy my fiancé an iphone with for a gun? I'm in Oklahoma, a very pro gun state. I want to get one before Obama takes guns away from law abiding citizens and leaves them defenseless. Don't tell me about how guns are bad and kill people. We all know that's a lie. Criminals already have guns and nothing can be done about that. I want to be able to get a gun while I can to protect us. Should I go hungry to buy a gun? What do you think?

Iphone 5 black screen not working?

So i dropped my phone pretty hard yesterday, i went to see if it was alright, no cracks or anything however the screen wasn't working. Siri and the silent button vibrations worked, as did the charging sound whilst charging. When i clicked the lock button the screen lit up slightly but was still black and when locked went back to a full black, was really hard to see. I put it in dfu mode and restored it now it doesn't do anything when i connect it to a computer and yes it is charged. What do i do i have no phone please help everything works but the screen:/