Hello,
First, I invite you to check that your mobile is up to date.
At the same time, the "Mobile data" option must be in place.
Once activated, it will be necessary to do a test.
You can also reset your phone from your customer area. Then simply click on the "Mobile" tab and then on the "Configure a mobile (Web / SMS)" link. All you have to do is follow the directions.
Don't forget to restart your phone.
Do not hesitate to come back to me if necessary.
Good day