I purchased (used) a 2013 GMC Sierra 1500 SLT. It has the installed package for on-star, radio (w/Bose speakers), etc. which was very nice for the year. I can pair/connect my smartphone to the unit, for hands-free calling, but it looks like the radio is 'older than dirt' and will not accept bluetooth pairing; just the aux cable. So, the question(s) are about upgrading: Is it worth it, or not (i would have someone do it - not hands-on enough to tackle it myself)? Has anyone done it yet? Options - GMC or aftermarket? Just curious at this point, because I normally like leaving things as is... thanks for any info/suggestions.