Hi, I would like to share my story of a Router.
This is for anybody who want to buy this router.
Don't get me wrong, this is a very capable mobile router/modem like no others.
The size and friendly GUI make easy for everybody to set up, where OpenWrt could get you a headache by just setting Scheduler.
Piece of Art and I love it even now 
I bought GL-XE3000(with battery)
Hopping this is gonna be my ultimate travel router.
Few days ago, got chance to play with small counterpart Opal GL-SFT1200(with up to date) and already notice some small issue.
When USB tethering I got disconnect sometimes(that could be my loose USB port) witch did not bother me.
But when I connected again I was missing prompt about tethering options on my phone(no issue on Puli AX)
After soft Reset, everything was back in normal.
So when I got Puli AX Updated Firmware, everything OK
Inserted Sim card from Plus(plus.pl prepaid Poland), in GUI I hit Auto Setup and waited but no connection. Fair to Good range on Antennas.
Same issue I had on another sim card from different country.
Was trying to connect but no success, so I used Manual Setup and changed APN setting for:
APN plus
TTL 65
Authentication NONE
Still nothing.
So I made a test, pull out sim card from router to my phone and no problems, Internet work like a charm.
Put back sim card to Puli and…. No luck I was trying many different settings, profiles,auto setup and even Voodoo magic 
I got so frustrated so even clone my phone IMEI back to router.
I thought that will do the trick, NO!
Still same issue, router was connecting and he failed.
When then I was doing some APN stuff again nothing special
suddenly it connected and everything works !
I have no clue why ? Changed APN to stock and work, use auto setup and still work.
I hard reset router to be sure that is was me setting APN-s but
after hard reboot its just work. Fuck...
But why? I don't know, maybe is it my Cellular Provider doing something maybe its a router...
I hope somebody in GL-iNet team gonna make some changes I see not olny me have this kind of Problem.