If you believe prison is for "punishment" and that prisoners are "fundamentally bad" then the answer is no - don't let them do anything that could improve their lives. However, if you believe prison is for "rehabilitation" and that "people can change" then exposure to current tech, within reason, would be good thing. I vote for the latter, mainly because almost everyone who goes in comes out.

And now for the off-the-rails part of my answer... maybe we could limit prisoners to outdated technology - they might end up with decent jobs maintaining old mainframes or Cobol or Fortran - somebody is going to have to do it and a lot of the old school guys are retiring.