Case Study: Sandboxx achieves 24-hour letter delivery and improved recruit retention with Twilio

Supporting Military Members and Their Loved Ones Through Better, Faster Communication

Sandboxx helps service members and their families stay connected throughout a recruit’s military journey, addressing the uncertainty and stress that come with deployments and basic training — where recruits often can’t keep phones. Their mission is to make military life easier by enabling fast, reliable communication between recruits and loved ones.

They offer Sandboxx Letters: a mobile app that lets friends and family write a letter, upload a photo, and have it overnighted to basic training with pre-addressed return stationery and tracking. Using Twilio Programmable Messaging and Verify to invite and authenticate contacts, the service delivers letters in as little as 24 hours (vs. 3–7 days by standard mail), has sent nearly 4 million letters to 1.5 million users, speeds delivery end-to-end by up to two weeks, and helps reduce dropout rates and support costs.

Sandboxx

Shane McCarthy

Chief Marketing Officer