port out bro. no contract

u only need to pay prorated bills.
lets say u active start on 10/11/2017, 10-14 will be ur prorated bills. but make sure you request for port out not terminate

port out, u maintain same number
terminate, u lost the number

they charged 2 months because webe's bill is advanced bill, they charged first but they wont block ur account.
lets say u activated on 21/10/2017, ur bill will be 21/10/2017 - 31/10/2017 for first month, 2nd month 1/11/2017-30/11/2017 (for advanced bill) and if you terminate, will count as prorated, can refer on first page for FAQ
nope for iphone and never will be (AFAIK)
tethering until end of this year 10GB, but you know, webe, for sure "extension" so many times extension already