Yes, one Twilio user login may have access to multiple Twilio projects. Here are the steps for switching between multiple projects:

1. Login to your account at www.twilio.com/console.
2. Click the user login drop-down menu in the upper left corner.
    
3. Select the desired Twilio Project from the list. If the login is not listed here, click View All Projects to see a list of each Twilio project your user account has access to.