Switching htc desire 626 to iphone 6 or 6 plus

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Switching htc desire 626 to iphone 6 or 6 plus

Hi, so I had my HTC desire for a year and a few months but it's starting to cause problems . How much would it cost to switch from this phone to apple . Do you think that's a good idea or should I stick with Android? And also does anyone have a solution to why my HTC keeps making this loud noise and then blacks out a restarts? It makes me think it's gonna blow and for some reason it only does it when I'm not around people so when I want to show someone it's just fine lol I hate this phone . anyone please ?? Thanks