SendHub is retiring their free accounts on Sept 12. I never used them for voice, and their pricing is based on their improved voice service, which I don't use, and awfully high (I'm eligible for the $15/mo plan) for what I do use, so I'm moving elsewhere for my text msg reminder services.
I currently have three plans I'm contemplating.
One is to use my SendHub number, while I have it, to create a fresh Google Voice number (which is free), and then use Google's API (if it still exists) to write my own app to provide the SendHub functionality GVoice lacks. Of course, Google might pull the plug on GV at any moment.
The next is to whip out my credit card and subscribe to Oh Don't Forget. While it's non-zero, the price is basically right ($5/mo or $50/yr), but has a catch: clients can't text me back (last I checked). I've mostly trained all my clients not to reply to my text alerts from SendHub, but (1) new patients, and (2) there's one who is only recently broken of the habit.
The third is to get a Twilio account (cheapest non-free option, I think) and write my own #%(*@ webapp for it. If I do this, then I'd offer to share it, for a modest monthly/annual fee of my own, with my peeps at the clinic.
(NTS: my-cool-sms.com looks fabulous, but, unsurprisingly including as it does unlimited international texts, it's exorbitantly expensive. If you ever need to send scheduled reminders to many clients in Azerbaijan, there you go.)
(NTS2: tropo.com and nexmo.com look like potentially viable Twilio competitors.)