You can upgrade to a different plan by logging into your SimpleTexting account on a web browser. After you log in, click on the person icon in the upper righthand corner. Then select Billing, Change Plan, and select your new plan. From there, select Update Plan, and you'll be good to go. 😃
You can also upgrade your plan by clicking on the Plan button on your SimpleTexting Dashboard.
All changes are reflected in your account immediately.