She is part of a niche market of technology users who buy smart phones such as the Sidekick II and the Blackberry, not just for fun but as a means of communicating with each other and connecting to the hearing world.
While a celebrity such as Paris Hilton might use a Sidekick II to, say, send a nasty e-mail to her former friend Nicole Richie, the device has a much more practical purpose for someone such as Vazquez-Hernandez.
"In my opinion, the most important (device for a deaf person) to have is a Sidekick II," says Vazquez-Hernandez, who also uses a desktop computer and a video phone to communicate from home.
The Sidekick II is not the only technological communication device used by the deaf and hard of hearing.
Her cell phone, like the Blackberry, will do many of the same things as the Sidekick II, but the Sidekick remains the most popular choice among most of the people she works with, she says.
T-Mobile, which is the sole service provider for the Sidekick II, gives special training to its sales agents, instructing them on how to best communicate with shoppers who cannot hear.
The mobile Internet handset developed by Danger Inc and manufactured by Sharp Corporation provides users with unlimited data use when combined with any of T-Mobile's voice plans for EUR15/month and, in addition, the monthly data charge will be waived for the month of June for new T-Mobile Sidekick II customers.
The T-Mobile Sidekick II is available now priced at EUR99.95 with a service contract.