The former England youth international midfielder has agreed a 12-month deal, with the option of a further year, and joins the Under-23 squad under boss Steve Stone.
Phillips, who came through the youth academy at Liverpool before two years at Norwich City, has spent pre-season with the Clarets.
He has earned a contract after becoming an integral part of Stone’s group on and off the pitch over the past month.
“I’m delighted to get a deal,” said Phillips, who was capped by England at Under-16 and Under-17 level.
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“There’s been a lot of hard work. I went to Poland, which was a really good tour, and then I’ve come back here and really enjoyed it and had a few games as well.
“I can’t wait for the season to start now and hopefully we’ll have a good start and I’ll get some games under my belt.
“It’s quite a young squad and hopefully I can help out a few of the younger lads moving forward. It’s a good group and I’m looking forward to what’s to come.”
Phillips has played first-team football during loan spells from Norwich with Cambridge United and Hamilton Academical.
“Hopefully I can get a chance to push on and hopefully get a chance to train with the first team and show the first-team manager what I can do,” he added.
“That’s what I’m here for, to try and get as high up as I can, and keep enjoying my football.”