There is a known Android Bluetooth connectivity issue - Monimoto does not work with Android 6.0 (Marshmallow). This version of Android is causing connectivity issues between Monimoto and devices running this OS. There is nothing we can do about this as many other manufacturers encounter this issue too. The only solution to this issue is to upgrade your phone to Android 6.0.1 or higher.
Android 6.0.1 has addressed Bluetooth connectivity problems and Monimoto works well with it.
Here are some of the phone models that have been tested and proved to be working with Monimoto (with Android versions other than 6.0):
Huawei P10
Huawei P10 Lite has pairing issues due to the drop in Bluetooth connectivity
Huawei P9 Lite
HTC One M7
HTC One M8
LG G3
LG Nexus 5X
OnePlus 2 (Most OnePlus need restart phone before pairing)
OnePlus 5
OnePlus 5T
Samsung A3
Samsung S5 (hard to connect to S5 NEO)
Samsung S6
Samsung S7
Samsung S8
Samsung Note 3
Samsung Galaxy Note 8
Samsung J7
Xiaomi Mi 10 Lite
Xiaomi Redmi Note 4 has pairing issues
Xiaomi Mi A1 (some need restart phone before pairing)
Xiaomi Redmi Note 5 has pairing issues
Xiaomi Redmi Note 7 has pairing issues
Blacklisted phones:
All Android phones without Google Play, such as Huawei P40, Huawei P40 Pro, Huawei P40 Lite
Huawei P8 lite
BLU Vivo 6
NEXUS 6
Xperia XZ1