[Moto X Q&A] KidJoe:
What could be the reason?

First let me start by saying, I've seen you post looking for help in several threads now. Unfortunately we don't use your carrier so there is a good chance none of us can help you resolve your specific issue. All we can do is give you the general tips that might help. That being said, the following sums up the MANY threads about using the Verizon Wireless (VZW) Moto X on a GSM carrier like ATT and T-Mobile in the USA and they should apply to you...

1. is your carrier CDMA or GSM?

If CDMA, the VZW X likely wont work with it no matter what you do as it supports the frequencies for 1xRTT/CDMA/EVDO that VZW uses which may differ from what your carrier uses, plus the authentication values needed for 1xRTT/CDMA/EVDO are hard coded to Verizon's settings and I haven't seen discussion to change these to non-Verizon settings like we could with older CDMA feature phones.

If GSM, since the VZW X is Sim unlocked, and supports quad band GSM/Edge 850/900/1800/1900Mhz, as long as your carrier uses those frequencies you have a chance of at least voice and EDGE data speeds. When it comes to HSPA or LTE data speeds, that depends on the frequencies your carrier uses vs what frequencies the VZW Moto X supports. Motorola.COM properly lists all the bands the VZW X supported when it first shipped. The Kit Kat Rom update has also added LTE Band 4 support to the VZW X, which I do not think is listed on Motorola's web page yet.

NOTE: if your carrier is GSM, you need to make sure you go into Settings -> Wireless & network settings (more..) -> Mobile Networks.. and enable roaming, and set the network mode to either Global or GSM/UMTS.

2. Do you have the right APN settings for your carrier?

In some cases, I've had the APN settings come down automatically when using a Non-VZW sim in my VZW Moto X and everything worked. Other cases, I had to manually input the APN settings before it would work and the "Emergency call only" status would go away. I also experienced even though I had entered the correct APN settings, MMS didn't work.

So its important you have the 100% correct APN settings, make sure you make no typographical errors when entering, and even then, there is a chance things might not work.

3. There is an apparent problem with voice/data LTE and such when using a GSM SIM. It impacts T-Mobile, but I haven't seen if it also impacts ATT (not likely due to ATT using different LTE bands the VZW X can't connect to). For more info, see this thread -> http://xdaforums.com/showthread.php?t=2578665 and start around post #14.

Finally... Can you roll back to Jellybean? This question has been covered many many times in other threads which is why you are getting "search" and "read" type responses.

For the Verizon Moto X there are 3 ROMs at this time...

Initial Shipping JB 4.2.2 ROM (Blur_Version.139.10.53.ghost_verizon.Verizon.en.US).

First OTA Update JB 4.2.2 with the Camera Update ROM (Blur_Version.139.15.1.ghost_verizon.Verizon.en.US),

KitKat 4.4 ROM (Blur_Version.140.45.5.ghost_verizon.Verizon.en.US).

If your phone is already using the "camera update rom" or Kit Kat rom, you can no longer flash the initial shipping JB rom, but you can flash the other two. There are threads discussing how to use RSDLite, or fastboot, to flash the ROMs if you need to know how.

NOTE: the "Blur_Version" in parenthesis denotes how they are listed on -> http://sbf.droid-developers.org/phone.php?device=0 and When visiting SBF.Droid-Developers, when ever you are on the phone selection page be sure to pick the Moto X, not the Droid X!!!

If you are running Kit Kat now, you could try to flash back to the Camera Update rom and see if you have better luck.

And that is all I can offer. Sorry.