Please follow the steps below:
1. Please turn off the Bluetooth function of all devices that have paired with the speaker before. (Or you could press and hold the multi-functional button of speaker, which could disconnect the speaker)
2. Turn on the Bluetooth function of your phone, find "TaoTronics Rock" and choose "unpair" or "ignore". Then search Bluetooth devices, find "TaoTronics Rock", choose it.
3. Try to pair the speaker with your phone again and see whether it can work.