I created a Youtube describing how to use an ipad or phone with a bluetooth microphone to enable a deaf person to see what is being said. see
BTW I use a cochlear implant, as you will see
To be honest, I have never seen the technology that is unobtrusive enough and effective enough to translate speech to text, there are many claims, but the issue of developers is accents, regional differences, speech variations and background noise.. I don't think carting around phones or ipads will do it for most of us. Even the 'glasses' don't function really. The only effective answer is good hearing!