Network not available - no more internet access

I’ve download and install Avast for Android on my Galaxy S3.

Everything works fine, except when I decided to register and create an account.

I enter my email, a password, password again and the phone number.

Except that I made a mistake in the phone number.

Soon after, I’ve got this message:
The SIM card or phone number data of your device XXXXXXXXX has been updated.
New IMSI: 00000000000000 (not the real number)
Old phone number: +18888888888 (not the real number)

Since then, I cannot go on the Internet, take my email, etc.
I have to enable Wifi to go on the net. When I disable it, no more network.
And I can send and receive phone calls.

Any solution ?

Seems not to be related to Avast. We do not influence your network in a way you describe. Did you enable avast firewall?