I created a shareware Tetris clone for OS X in the mid 2000s and provided my cell number in the readme. I'd get a trickle of calls from all over the world at all times of day. That's where I learned never to have a serial number generator that included the number 0 since it looks so close to the letter 0.
It was weird to be out and about and suddenly get a tech support call, but people were usually really nice.
It is very, very difficult to offer phone support as a solo developer, particularly at low price points (below e.g. $5k per year) and for low tech-literacy customers. You can still do it, if you need someone to talk to, you want to do customer development, or you have a customer who strikes your fancy for non-market reasons, but you probably should not message the expectation that you're available.
The point here is not what the advantage of phone support is but to provide the service personally. You can outsource anything, but if you read the article, the learnings you get from doing it yourself are invaluably useful.
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