Refresh your Network by turning on and off Airplane Mode (turn it on first, and then turn it off). Turn On to activate the Airplane Mode, and Off to deactivate it. Make sure to select single network such as 2G/3G/4G only and try on another device
If you’re trying to access the Internet inside a building, try to move to a part of the building that has a stronger connection. For example, move from the basement to an open space.
If you are still experiencing the same problem, don't hesitate to contact Telkomsel on the following channels: