1. Have you verified your settings on chase.com? I don't find this aspect of the current website easy to understand, but there could be something missing or inaccurate there. For example I see: Before you can use this phone number for Account Alerts, you'll need to set up text banking through Chase Mobile. Even if it worked in the past, an update on Chase's end might have erased a number or disabled a setting.

2. Do you have a Chase app installed on your phone -and- do you use it with more than one Chase UserID?