Can i factory reset my iphone if it won't even turn on

Can i factory reset my iphone if it won't even turn on? Help As soon as possible?

Added (1). I have an iphone 5s that started glitching and restarting by its self then random colour started coming up when it restarted but now it won't even turn an it goes to the apple logo for 10 seconds then shuts off! I have a warranty so am going to send it back but it says you have to factory reset your phone!

IPhone 5c won't stay connected to Wi-Fi network?

IPhone 5c won't stay connected to Wi-Fi network. I just had the screen completely replaced and it has no service at the moment. While I wait to get service I was going to get a feel for it using Wi-Fi, as far as apps and internet. It started off fine, I downloaded like apps and after about minutes the Wi-Fi disconnected. I tried everything that I found online on forums on youtube everywhere. Tried resetting the network settings, the location option in privacy, and just abour everything else, turning airplane mode on and off, nothing seems to make it work. On the Wi-Fi setting I see my router pop up but after seconds it goes away, they iPhone scans and it reconnects and it does that non stop. Currently running on iOS 8.3. Any ideas what's going on? Btw my Wi-Fi works with just about everything else I have in the house…

Found a great iPhone 5 in blue in the bus how to keep it?

I found a great iPhone 5 in blue squeezed in-between the end of the seat while I was trying to push in my empty crisp packet. Well so I definitely wanna keep it and its gonna be a great upgrade from 4, but I've heard they have a lot of tracking devices on it so is there a way to use it myself without any problems? No jailbreaking though

How to print full size image from iphone?

I'm trying to print an alphabet chart from an image I searched on my phone but when I print it out it doesn't come out 8x11 size it just prints out really small. Anyone know how I can make it full size?

I hate iphones? Your Opinions?

Well i have used iphone 4 and 5s but i still love android and ios app my fav mostly ask to pay for and in android i dowload paid apps through utorrent so you guys what have you seen in iphones i like it stylish and it sound earphones are best in the world i will buy apple shuffle rather than iphone so?