Activation Loop when SIM is inserted

good evening guys.

I got a problem to activate my iPhone 6+

(I’ve read previous thread, not helpful much)

I bought this (refurbished unit) last year.

it was on iOS 9.

I am able to activate it before without any issues.

insert the SIM, you’re good to go (no TurboSIM).

I also able to update to iOS 11.2.1 without any issues (OTA update)

but, things happen after I restore the iPhone using iTunes (clearing things up).

the iPhone can be activated without SIM.

but once SIM is inserted, I got stuck in activation loop.

I got stuck in the screen as attached below.

when I plug-in to iTunes (using the original cable),

I got Error 0×E8000015

(I’ve done the workup as stated in previous thread, no avail)

I try activating using iTunes, no avail.

the iPhone just flickering the screen (as attached above).

I have no idea what to be done next.

can someone help me with this?

I am planning to give this iPhone to my wife