Probably the easiest way is by using. I believe was involved in the development of CallMom, and offers several APIs on . Pandorabots also has a new API available at .
Guile Lindroth seems to be close to releasing a mobile version of his customizablevirtual assistant, though not a true mirror or extension of the popular desktop assistant, but more like an additional product.
Good open source options include PHP basedas well as ‘ award winning (which has again, just won the for 2014).