The problem is, currently I am using Umobile, and it is still showing "Emergency Call" and no signal at all.

Samsung itself has tried to use all the telcos for my phone, and the issue still persist bro.

Seems the only way is to solve it, it's by communicating with Maxis

hi, im facing same problem as urs.
im using note 5, seller also signed for zerolution plan. went to Ssamsung and also Maxis (yesterday).
they wont unlock it and also wont give the "owner" contact number....
this is duos sim , my slot 2 still able to use just cannot use slot 1.
seek for u all helps, if u have any idea/information to unlock the imei plz share to me.. now i hv 2 sim but cannot use in Note 5... sad...
thanks for your topic, share this information to others dun let those CHEATER keep sign zerolution plan and sold to us end up x bayar and imei blocked.

++ my phone still under warranty until coming Feb 2017 lolx