I recently switched to the pre-pay cell phone plan at AT&T and they charge every 30 days; not only is AT&T a huge company with plenty of pre-pay customers, even Straight Talk has an auto pay option that charges every 30 days. There is currently no way to set this up in Quicken (2016) that I could find, or that customer service could direct me to. Your closest options are every four weeks or once a month, and neither is really satisfactory for this situation.
NOTE: This was originally intended for BOTH platforms, Windows AND Mac, and was/is tagged as such. Under the old forum, it was possible to track it in both places. On this Vanilla forum platform, it is not. I hope the devs are taking note of this for development on BOTH platforms.