Try these things:
1. Erase any bonding information in both your meter and phone.
a. Meter – press and hold the power button for 10 seconds. At the end of this time the meter will flash magenta indicating bonding info is erased.
b. Phone – From settings, find Bluetooth and then display Bluetooth devices. You may see “Illuminati Meter”. Select it, and then “forget” it.
2. If you are using an Android phone, make sure location services is on.
3. What iOS version is running on the iPhone 5C? And Android version for Nexus 5x?