I'm searching for a good synonym for communicative, but with an emphasis on being in constant communication over time, not merely the "amount" of communication (so talkative and such don't work). A short phrase will work as well.
Example context:
Unlike our inferior competitors, we are great because we are communicative (e.g. we constantly stay in touch with you).
Best Answer
For this particular instance I like at [one's|your] disposal. You could also say that you are a [call|click] away.