@gardiboy thanks for your feedback bro
1) I'm assuming I have to restore to a new phone. So with that said, what if I do not wish to do a restore then since I'll be losing all my data.
2) If they're sponsoring it FOC, I won't mind giving it a try.
3) wow, most likely have to ask them to follow me down an elevator. Pretty sure I can replicate the problem.
4) Not quite sure what that means
5) Agreed, but my other iphone models are not facing this issue. And apparently, the fellow HWZer using the ip6 plus under M1 not facing this issue as well. Definitely not 100%, but at least if my current iphone 6 can perform like the other previous models I used, I'm happy enough with it.
Anyway, I just called in to 1688, CSO mentioned I should just wait for the next iOS software update and then see if I still need to head down to comcentre after that. According to him, many other users are facing weird cellular data problems including this particular case. Another one quoted by him is "can see 3G/4G but can't surf net"