Answer 1

​Do the follow on your android phone

1.  Press the Home Key > Menu Key > System settings > Wi-Fi.
2. Slide the Wi-Fi switch to the ON position.
3. Tap the Wi-Fi network name and then tap Forget

And then reconnect again

1. Press the Home Key > Menu Key > System settings > Wi-Fi.
2. Slide the Wi-Fi switch to the ON position to turn on Wi-Fi
3. Tap a network name to connect to it
4. If the network is secured, enter the password and tap Connect.

If still Unable to establish connection with the phone.

• The wireless network may not be in range or has too of a weak signal to provide a successful connection. Check the signal bar to ensure you have strong connection.
• Re-enter the key on the device to match the key configured on your phone. Make sure that the encryption type and security settings match on the device and your phone.
• If WPA2 PSK encryption is in use, check that the key configured on the device matches the key entered on the phone.
• "Forget" the connection. This will clear the connection and allow you to reinitialize with the your phone.
• Turn off the connection from your device, turn the phone connection off. Turn back on your device first, then wait for 1 minute and then turn on and enable your hotspot to your phone.

Connection keeps dropping

• Make sure your WiFi sleep policy isn't timing out prematurely on your device. (Found under the Mobile Hotspot settings > Inactivity timeout)