You may have recently been contacted by PC Mobile regarding potential impacts to location accuracy during 9-1-1 calls on your device.

This is due to the GPS Week Number Rollover (WNRO) event, which will occur as early as April 6th, 2019, location accuracy for GPS devices, including 9-1-1 location accuracy for certain mobile wireless devices, may be impacted. This is a global GPS issue and not restricted to the wireless industry or 9-1-1. The Week Number Rollover refers to the limitation of values in the GPS message format counter. After the counter reaches the 1024th week, it will reset to zero, which is what will occur as early as April 6th.

Properly configured devices should not be affected. However, some hardware chipsets incorrectly handle the April 6, 2019 rollover. Because GPS Time is used for user location determination, an improperly configured device may result in improper location information associated with 9-1-1 calls. In addition to location accuracy during 9-1-1 calls, device applications that depend on GPS location may also be impacted.

Most devices are properly configured. However, the following devices are known to PC Mobile to be affected beginning April 6th. Certain devices have a software patch available to correct the issue. If no patch is available, you may need to purchase a new device to ensure the functionality works. The following list provides known impacts and possible resolution for known affected devices purchased from PC Mobile:

Device	Resolution
Alcatel 1	The latest software for this device will be available to provide a fix for WNRO. Please ensure you are running the latest software by checking your phone settings. Please use WI-FI to download the latest software if you do not want to use data or unable to use data. Depending on your plan, data charges may apply. Check for updates by following these steps: 1. Touch Apps 2. Touch Settings 3. Scroll and touch System 4. Touch About phone 5. Touch Updates 6. The phone will check for updates 7. If an update isn’t available, touch Home. If an update is available, wait for it to download and install.
Alcatel A50	The latest software for this device will be available to provide a fix for WNRO. Please ensure you are running the latest software by checking your phone settings. Please use WI-FI to download the latest software if you do not want to use data or unable to use data. Depending on your plan, data charges may apply. Check for updates by following these steps: 1. Touch Apps 2. Scroll to and touch Settings 3. Scroll to and touch About phone 4. Touch Updates 5. The phone will check for updates 6. If an update isn’t available, touch Home. If an update is available, wait for it to download and install
Alcatel ONETOUCH Pixi3	The latest software for this device will be available to provide a fix for WNRO. Please ensure you are running the latest software by checking your phone settings. Please use WI-FI to download the latest software if you do not want to use data or unable to use data. Depending on your plan, data charges may apply. Check for updates by following these steps: 1. Touch Apps 2. Scroll to touch Settings 3. Scroll to and touch About phone 4. Touch System updates 5. Touch the Refresh icon to check for updates 6. If an update is available, touch the Download icon 7. Wait while the phone downloads the update 8. Touch the Install icon to install the update
Alcatel ONETOUCH Idol X	To explore your options please contact us. You may need to purchase a new device to ensure GPS location accuracy.
Alcatel ONETOUCH Idol Mini	To explore your options please contact us. You may need to purchase a new device to ensure GPS location accuracy.
LG Optimus L5 II	To explore your options please contact us. You may need to purchase a new device to ensure GPS location accuracy.
Sonim XP5560 Bolt 2	To explore your options please contact us. You may need to purchase a new device to ensure GPS location accuracy.
Sonim XP5560 Bolt 2 IS	To explore your options please contact us. You may need to purchase a new device to ensure GPS location accuracy.
Sonim XP5520 Bolt	To explore your options please contact us. You may need to purchase a new device to ensure GPS location accuracy.
Sony Xperia XA	To explore your options please contact us. You may need to purchase a new device to ensure GPS location accuracy.