below 10" , 4G LTE, below 2.5K hmmmmm...

Teclast X98 Air 3G Dual OS 9.7"
http://www.teclast.com.my/ecomm/index.php?...t&product_id=75
price: rm899

New Venue 10 Pro Tablet 10.1"
http://www.dell.com/my/business/p/dell-ven...-5056-tablet/pd
price: ????

Microsoft Surface 3
as referred as above

there is not really so much choice for laptops with LTE and even less for windows tablets with LTE. you probably find a lot more choice if you drop the LTE and use your HP as a wifi hotspots or use a small USB LTE modem but if you must....

if you can wait for a little while, there are a few new ones coming out but i am not sure of the price:

- Samsung TabPro S
12-inch, 2,160 x 1,440 Super AMOLED screen
Sixth-generation Intel Core M3-6Y30 processor (dual-core, up to 2.2GHz)
Intel HD Graphics 515
4GB memory, 128GB or 256GB storage (SSD)
5200mAh battery with up to 10.5 hours battery life
Charges in 2.5 hours with USB Type-C port
USB Type-C port also capable of USB 3.1 data and HDMI video output (with optional adapter)
Optional Bluetooth stylus
5-megapixel front camera, 5-megapixel rear camera with autofocus
802.11ac WiFi and Bluetooth 4.1
GPS and GLONASS positioning
LTE model available in some regions

and here is some with 3G models from HP, but their overall specs is really not desirable:
http://www.techattack.my/affordable-hp-str...nched-malaysia/
specs image:
http://i0.wp.com/www.techattack.my/wp-cont...tions.png?w=831

anyway, good luck with your search.