Is the Samsung Galaxy Grand 2 4G a compatible phone?

Yes Samsung Galaxy Grand 2 supports the 4G LTE. As you could see in Samsung Galaxy Grand 2 detailed specifications :

GENERAL

Release date : November 2013

Form factor : Touchscreen

Dimensions (mm) : 146.80 x 75.30 x 8.90

Weight (g) : 163.00

Battery capacity (mAh) : 2600

Removable battery : Yes

Colours : White, Black, Pink

SAR value : NA

DISPLAY

Screen size (inches) : 5.20

Touchscreen : Yes

Resolution : 720x1280 pixels

Pixels per inch (PPI) : 280

HARDWARE

Processor : 1.2 GHz Quad-core

Processor make Qualcomm Snapdragon 400

RAM : 1.5GB

Internal storage : 8GB

Expandable storage : Yes

Expandable storage type : microSD

Expandable storage up to (GB) 64

CAMERA

Rear camera : 8-megapixel

Flash : Yes

Front camera : 1.9-megapixel

SOFTWARE

Operating System : Android 4.3

CONNECTIVITY

Wi-Fi : Yes

Wi-Fi standards supported : 802.11 a/b/g/n

GPS Yes

Bluetooth : Yes, v 4.00

NFC : No

Infrared : No

USB OTG : No

Headphones : 3.5mm

FM : Yes

Number of SIMs : 2

SIM 1

SIM Type : Micro-SIM

GSM/CDMA : GSM

3G : Yes

4G/ LTE : Yes

Supports 4G in India (Band 40) No

SIM 2

SIM Type : Micro-SIM

GSM/CDMA : GSM

3G : Yes

4G/ LTE : No

Supports 4G in India (Band 40) : No

SENSORS

Compass/ Magnetometer : Yes

Proximity sensor : Yes

Accelerometer : Yes

Ambient light sensor : Yes

Gyroscope : No

Barometer : No

Temperature sensor : No