about wifi problem.. i also have this problem before this about 3-4week back.. but now seems not having this issue on my iphone 6s plus 9.3.1.. at 1st I started having this issue i got bit fuckup some how when i turn on VPN app the speed when to normal but when i turn off and the speed when back to 0.65mb and jerking and what did i do is i restore from icloud back to the time that my iphone 6plus that have jb in it and a 9.0.2 and wifi when back to high speed again.. here is some tip to help u guys if u encounter similar problem.. try on/off toggle the wifi network, on/off the airplane mode and hard reset