I am still learning all the ins and outs of an Android phone (in my case the Droid 2).
If you do have internet access with you plan from Metro PCS you probably want to look at this site
Hamilton CapTel: Mobile CapTel: What is Mobile CapTel?. It is kinda hard to find but if you are not in an area where you have voice and data at the same time or if your particular phone model does not support it you need to look here
Hamilton CapTel: Mobile CapTel: Android OS Browser: Placing Calls for an alternate method to the app. It is my understanding that the Android phone can be used for the captions and another phone for you to talk from. I am just at the exploratory stage with this.
The page that GraysonPeddie linked to shows a device that is no longer manufactured. I did have one in the analog days that did not have the cord but strapped to the earpiece of the larger phones that were in use then. It worked well for use with VCO but was not compatible when digital cells came out. They then developed a device that was – The PocketComm which was a very slightly larger device with a full keyboard but still fit in one hand after connecting to the headphone jack on the cell phone via a cord.
I found the PocketComm to work will when in good shape but much more delicate than a cell phone. I think it must have been designed by a man that kept it in a case clipped to his belt rather than in a purse as a woman would and thus not subject to the additional bumps and bangs and more likely hood of being dropped if in a purse! I am not sure when I got my first one but have had to repair or replace most years. I had gotten a second one as a backup and am having trouble with both at the present time. Putting about $100 yearly into keeping a working one is what led me to exploring for an alternative. I do not know how durable the Compact/C
Ultratec » Products » Text Telephones » Portable TTYs » Compact/C by Ultratec is. I first came to AlDeaf when I was trying to get feedback about that and did not find anyone with experience with that particular unit.