Proceed carefully before you light up VHF / UHF simplex frequencies with digital voice modes (e.g. D-Star, DMR, C4FM, P25). It can range from mildly aggravating to completely intolerable for some users to hear the buzzing digital wasp's nest on a frequency "thought" to be analog simplex.
The ARRL Band Plan doesn't address all the details / modes / specific frequencies used for VHF / UHF simplex communications. One of several places to find more info is here -
https://sera.org/index.php/frequency-coordination/frequency-utilization-plans-revision-band-plans/
Because this info is subject to change I didn't quote specific frequencies, but did quote the following -
"Of particular note, some simplex frequencies listed in the ARRL Band Plan may, or may not, be repeater inputs in some areas as our coordinators make changes to better suit their area."
"Another example is the different assignments of spectrum for FM Voice Simplex, and Packet/ Digital Simplex. Repeater users as well as packet/digital users are asked to honor these frequencies by utilizing the ones specifically assigned to the particular mode they are operating."
"All coordination and spectrum management by coordinators is based on “gentlemen’s agreements” and usage by all hams whether they are operators using FM repeaters, simplex, or packet digital using duplex packet modes or simplex. For spectrum management to continue to work successfully around the nation, operators must take the responsibility of working only frequencies in the mode in which that frequency is assigned."
"This prevents chaos and interference and arguments. All modes of amateur operations are well represented by frequency spectrum assignments on most all bands. Using only those frequencies assigned prevents unwanted problems."
Finally, here are the "most common" simplex frequencies I've seen used / recommended for various digital modes -
D-Star (2M) - 145.670
D-Star (70cm) - 440.9125 440.9250 440.9375 440.9500 440.9875 441.0000 * 441.0125 441.0250 441.0625 441.0750 441.0875 441.1000 441.1375 441.1500 441.1625 441.1750
* 441.000 is the National Digital Simplex Calling Frequency
DMR (2M) - 145.510, 145.790
DMR (70cm) - 441.000, 446.500, 446.075, 433.450
(.... and I'll let someone else fill-in with C4FM or other modes)