Putting pics / videos on iPhone 6?

I'm having trouble putting videos on my phone with iTunes. If I sync pics / videos onto my phone with iTunes, will it erase everything in my camera roll? Are there any other ways to put things on my phone without having to download a program?

This is how I copy videos to my iphone which I just did today http://www.justtext.com/messageboards/20160321084132.html?y

  • Why can't I send pics or videos to non iphone users? I have a IPhone 5s and I can't send pictures to anyone that doesn't use imessage, why is this and is there anyway to set my phone to send pics to all phones and not just imessage users?
  • Whatsapp iphone pics and videos? I have whatsapp on my iphone 4. When i click on the video or picture it automatically saves to my camera roll and i can view it. However i have lost my images but they are still present in the conversation on whatsapp. When i click the image it opens but doesn't save, if i hold down on the image it doesn't let me save and there's no button for it. Could somebody find me a solution, thanks in advance.
  • Putting iPhone videos into 1 file to then email? I have a bunch of iPhone videos that are each @10 seconds long that I'd like to put into one file and email. How can I do this? Otherwise I have to send each video 1 at a time
  • Putting another SIM card in my iPhone to get pictures and videos off of it? Would it mess anything up if I took the SIM card out of my iPhone 6 and put my old iPhone 5s SIM card in to download the pictures and stuff onto my laptop?