That is not an option for the San Bernardino County TENS at this point in time.
I agree with Bob that landlines and cell phones after a major quake will be useless. The only reliable means of communications will be ham radio and that's why it's been pushed so hard in this community.
Since this is a discussion regarding the need for a landline it's important to mention that phones within the 249 prefix do generally work when outside phone service is cutoff. You can't connect outside the community but it does allow you to call friends and neighbors and cell phones don't allow that option.
I can think of at least three times within the past two years that the lines that serve our area were cut.
That means internet service (and any VOIP phone) as well as cellphones were not working. In at least two of those instances there was no landline telephone service outside of Wrightwood.
Maybe I'm a bit paranoid, but I don't want to trust my phone service to someone who wants to cut a copper line to sell for meth/crack, or some construction worker who accidentally severs a fiber optic line.
That's why we have landline and cell service, and are ham radio operators...