> For the complete documentation index, see [llms.txt](https://docs.datacake.de/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.datacake.de/integrations/dragino-nb-iot/changing-nb-iot-bands.md).

# Changing NB-IoT Bands

Having Problems connecting your Dragino NB-IoT device? Changing Bands might be an option, here's how.

## Problem

BC660K-GL supports multi bands:

* **B1/B2/B3/B4/B5/B8/B12/B13/B14/B17/B18/B19/B20/B25/B28/B66/B70/B85.**

It will search one by one and try to attach, this will take a lot of time and even cause attach to fail and show **Signal Strenght:99**. User can lock the band to specify band for its operator to make this faster.

What happens is that the device starts at the first band, and probably in your country, the last one is used. Before the device can reach and try to attach using the needed band, it goes to sleep before it can connect, as the device connection routine has no option to search for the corresponding band. It always does this reconnect and cycle through all bands with every message sent. It will always fail.

## Solution

The solution is to lock the bands to the ones used in your country, and here's how you can do it.

This method is valid for BG660 devices, which are the latest series of Dragino devices with BLE connectivity for accessing the firmware terminal and button on the casing.

### Connect via BLE Terminal

* Connect to your device using a BLE Terminal
* Enter the password to be able to communicate with the firmware (the password usually is on a sticker on the device packaging)

### Enter Band Commands

* Issue the following AT commands:
* **AT+QENG=0** to check which band is actually in used.
* **AT+QBAND?** // Check what is the current used frequency band
* **AT+QBAND=1,4** // Set to use 1 frequency band. Band4
* **Europe General** **AT+QBAND=2,8,20** // Set to use 2 frequency bands. Band 8 and Band 20

### Using 1NCE?

* Band 20 probably is all you need

## Dragino Wiki

For all Bands: See: <http://wiki.dragino.com/xwiki/bin/view/Main/NB-IoT%20Deployment%20%2C%20Bands%2C%20Operator%20list/>

Document: <http://wiki.dragino.com/xwiki/bin/view/Main/General%20Configure%20to%20Connect%20to%20IoT%20server%20for%20-NB%20%26%20-NS%20NB-IoT%20models/#H2.2SpeedUpNetworkAttachtime>


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