[5] With adaptive hierarchical language models, Vlingo improves its speech-to-text recognition as it learns a user's speech and search habits.

[6] It was the first technology of its kind to use adaptive hierarchical language models to learn from the corrections a user would make.

[5] Vlingo servers analyze speech queries and send any recommendations or possible corrections back to the user.

[3] Vlingo had its own application with over 5 million users in addition to partnerships with a number of companies, including Yahoo,[7] Samsung,[8] RIM, and Nokia.

As Vlingo became successful, Nuance launched a series of patent lawsuits to attempt to weaken the company.

[11] In January 2012 AndroidPit discovered that Vlingo sends packets of information containing the users GPS co-ordinates, IMEI (unique device identifier), contact list and the title of every song stored on the device back to Nuance without proper warning in the privacy policy.

Users of Vlingo have also found the program sending data to servers at the dhs.gov domain name.