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Message: <blockquote data-quote="SimonP78" data-source="post: 2748495" data-attributes="member: 556474">BT here in context is Bluetooth rather than British Telecom! I prefer using the acronym BLE (Bluetooth Low Energy, which these sensors are) to avoid ambiguity. There is no reason why a different Bluetooth version will make any difference though. BLE was only supported from v4, so it will work or it won't. Certainly there have been reports of resetting phones and the like fixing problems with Libre sensors, however the sensors often come back on their own, so it's very hard to know whether resetting did anything or just wasted some time.The method I use is to run a BLE sensor scanner, which shows me a list of all the BLE devices within ~50m (depending on their type and broadcast power) - it's surprising quite how many there are! The libre sensors don't transmit continuously, but if you watch/look at the recent history of the scan after running it for at least a minute (they should transmit a reading once per minute so I usually leave it for 5 to make sure there's not a clock drift error and to hopefully give the sensor a chance if it is suffering from an intermittent failure), you should see the libre appear. If you don't see any devices I'd suggest you may have a problem with the phone (so a reboot might work), but if it's just the Libre that does not reappear, it's pretty compelling evidence that it's the libre itself that is not working rather than the phone.Under Android I use an app called "BLE Scanner" (I can dig out a Play link if anyone wants it), which is free. The Libres appear with a name that starts with ABBOTT and then continues with the device s/n. They don't appear to have a manufacturer specific "MAC" (not even the first section), so they may well be randomly generated (which is allowed afaiu and also now the convention for other devices such as Wifi.)</blockquote>

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