Welcome to the Dell Community @bdnm 

What WiFi card do you have installed???

Best regards,

U2

hello am sorry i cant tell, because i don't know how to check

@bdnm 

The Dell DW1506 does not have Bluetooth!!!

You would need to replace the DW1506 with an Intel 7260.

Intel Wireless-N 7260 WLAN WiFi 802.11 a/b/g/n + Bluetooth 4.0 Y74H6

https://www.parts-people.com/index.php?action=item&id=17059

Dell Latitude E6440 Owner's Manual:

https://www.dell.com/support/manuals/en-us/latitude-e6440-laptop/late6440_om/removing-the-wlan-card?guid=guid-0dcde6c6-c0e0-40a4-8605-3f2b4a18b65d&lang=en-us

Intel 18260/8260/17265/7265/3165/7260 WiFi Driver:

https://www.dell.com/support/home/en-us/drivers/driversdetails?driverid=mnk54&oscode=wt64a&productcode=latitude-e6440-laptop

Intel 7260/3160 Bluetooth Application:

https://www.dell.com/support/home/en-us/drivers/driversdetails?driverid=vhm3t&oscode=wt64a&productcode=latitude-e6440-laptop

Regards,

U2

@bdnm 

Right click on "Start" and go to "Device Manager".

Then click on "Network Adapters"

There you will find the model number of your "Wireless Device".

Regards,

U2

hello thanks for the feedback here they are

Is it a must i purchase a new hardware driver or i can download the software drivers and use them up.

Thank you.

Thank you i have a way out then.

Your very welcome @bdnm 

A dongle is the cheapest and easiest way.

Regards,

U2

I had the same problem. Tried to fix it whit support assist from dell,  didn't fix automatically. 

I fixed the issue by downloading an optional driver update from windows update. One or both of these helped:

Intel Corporation - Bluetooth Controller - Intel(R) Wireless Bluetooth(R)

Intel - WLAN - Intel(R) Centrino(R) Advanced-N 6235