# Cellular Troubleshooting

{% hint style="warning" %}
This page describes LEO 2 features available for **LINKA Fleets**. For personal use, visit our [website](https://linkalock.com) for information regrading cellular functionality
{% endhint %}

## Cellular troubleshooting&#x20;

#### Connecting to Network

In an area with acceptable cellular connectivity, the device will take 15 seconds to turn on cellular functionality, establish a cellular connection, and send a ping to the server.

In an area with poor cellular connectivity, it may take more time to establish a cellular network connection. The device will first attempt to connect to the last network carrier that it previously connected to. If connection is unsuccessful, the device will scan for other available network carriers and attempt a connection to each carrier individually.

For example, in the USA the device can connect to AT\&T and T-Mobile networks. If the device previously connected to AT\&T, it will attempt to connect again to AT\&T on its next connection. If it is unable to connect to AT\&T, it will attempt to connect to T-Mobile.

If the device is unable to connect to any network carrier after 10 minutes, it will timeout and automatically disable cellular functionality.&#x20;

#### Unable to connect to network

The following are a list of potential situations to cause the device to be unable to connect to cellular network:

* Ensure correct mode is used&#x20;
  * Ensure Airplane Mode is disabled, by connecting to the device with the Operator app&#x20;
  * Lock and unlock the device to trigger a State Change Ping&#x20;
* Ensure correct model&#x20;
  * LEO 2 Pro–NA should be used within North America&#x20;
  * LEO 2 Pro–INT should be used outside of North America&#x20;
* Lock battery is fully drained or below 10%&#x20;
  * When the battery is below 10% the device will enter Low Power Mode. Ensure the battery is charged, by checking the battery level with the Operator app. When the device is awake, the LED light should be blinking.&#x20;
* Lock in area with poor cellular connection&#x20;
  * Cellular will only work in areas with acceptable cellular connectivity. The lock uses the same network as most 4G LTE mobile phones. Check the cellular connectivity on your mobile device to ensure that there is acceptable cellular reception.&#x20;
* Lock damaged / Hardware issue&#x20;
  * After confirming all of the above, then it may indicate a hardware issue with the device.&#x20;
* System / Cellular Network down&#x20;
  * In some cases, the network carrier may have an outage. Consult with the LINKA team to determine which cellular networks are available in your country.

## GPS Troubleshooting&#x20;

#### Time To First Fix (TTFF)&#x20;

Time To First Fix refers to the amount of time for the device to obtain a GPS fix from when the GPS module is first turned on. Factors that affect TTFF include:

* Unobstructed view to satellites in the open sky&#x20;
* Time since the last GPS fix&#x20;
* Ephemeris data download speed - The device will automatically download ephemeris data from the internet to assist in obtaining GPS fix. The file must be updated weekly. With acceptable cellular reception, the device can download this file in less than 30 seconds.

In the best case scenario, the device can obtain a GPS fix in less than 10 seconds. Once the first GPS fix has been obtained, the device will be able to obtain subsequent GPS fixes instantly.

The quality of the GPS fix is represented by the “accuracy”. For example, a GPS fix with an “accuracy” of 100 meters would indicate that the true location of a bike has a high probability of being within 100 meters of the GPS fix returned. A smaller accuracy value would indicate a higher quality GPS fix.

If the device is indoors, it will not be able to obtain a GPS fix. The device will automatically timeout after 10 minutes and turn off GPS functionality.

#### Mounting on Bike&#x20;

To ensure best GPS performance, ensure the LEO 2 device is mounted on the bike with the plastic dome cover facing upwards.
