In the first instance, you can try:
- Removing (forgetting) the wireless network from your device WiFi settings
- Turning your WiFi off and on again
- Rebooting your device
It’s possible that your location may be causing interference with the WiFi signal – try moving to another location to attempt to connect to the service.
Some smartphone roaming client apps may interfere with connectivity on our network – try uninstalling/deleting the app and rebooting your device before attempting to connect again.