i'm using sandisk wireless connect. transfer rate is a bit slow but assess data rate is consider okay ie watch movie on iphone assessing the move from the wireless connect

went to Apple Store in Hong Kong to diagnose the battery, no stocks. have to order part and wait for 7-14 days

Actually is less than two years from now. He means that he can change battery anytime because the replacement program run for three years from first retail sale of the unit.

6s launched and first sale on 25 Sept 2015, means the program will run from 25 Sept 2015 - 24 Sept 2018.

TnC:
Apple Source

yes. and given 3 months warranty for the battery itself (out of warranty units). if your iphone still within warranty then it will follow iphone warranty.

as long as your phone is on the list, you are eligible. even it is out of warranty

if new, apple will assume the phone is no problem. have to at least activate it and use it for awhile then bring to apple store to claim.

in apple store, the genius will check both serial number and diagnose before allowing you for replacement.

yes. u can use the phone first. if got any problem even after warranty, u can always claim one for the battery

yes. even beyond warranty period

Have you reset network settings?

most of the time it helps.
but it will reset all the wifi connection saved before.

Which defect that you gonna claim? battery replacement program or part defects?

both mentioned above can claim for without receipt. but battery replacement program will be valid even beyond warranty coverage period. parts defects have to be within coverage.