Lots of users come on to the forums and check for new posts (me for one). It's REALLY aggravating when the first half dozen items are one cross-posted question. As are the next half-dozen. And the next. Also, it's easier for
you to keep track of answers, and
us to know where to post them if you keep the question to one thread in the right forum.
Most car manufacturers provide kits that will work with business-y type phones; as an example, have a look at Volkswagen:
Volkswagen UK > Accessories > Part Not found