How do you generate an easy to use interaction pattern that helps customers evaluate how much data they consume in a month? The goal being helping the customer decide what plan best fits their needs.

How do you convince a large and established company like T-Mobile that your design is the right way to go and that they should replace their existing design with yours?


By observing users as they interacted with T-Mobile's existing calculator, I came up with guidelines that I used to escort me through the full design cycle. Here are the guidelines:

Simple:The controls should be known and obvious to the customer.

Informative:The data calculator should leave the customers with a better understanding of what they can potentially get out of their data plan, and feel confident that they are choosing the best data plan for their usage.

Fun and playful:The data calculator should allow a customer to easily change settings or play with controls in a way that creates no risk and has no perceived cost (such as page loads or wait time). It should have immediate feedback and surprise customers at times.

When presenting the designs to the client, I came up with a strategy of revealing the design I knew they would agree to last, and in that way I was able to lead them toward the solution I thought would be best.


A huge win for T-Mobile, increasing the usage of the calculator on their site. The new Data Calculator is easy to use, it uses natural, everyday language and asks questions that the customer has to think very little about to answer meaningfully.

Go to website to play around with the final product.

  • Senior UX Designer; 2012