Mountain Rockie Talkies use channels 1-128. There are still only 22 channels available and channels above 22 simply cycle back through 1-22 but use a tone code (aka "Privacy Code") to block out other radio traffic. Most users feel that they are on a private line, but everyone on that channel can hear them. It's just that others on that channel can't be heard unless they are using the same tone code.
If you have a Rockie Talkie Expedition (GMRS), BCA, Baofeng, or pretty much any other radio, you'll need to set your tone code if you want to communicate with Mountain Rockie Talkies on channels greater than 22. Note that channels 89-110 are problematic and a handful of other radios will be able to set their tone code (199.5) to communicate on those channels.
Note that the following radios use the same Tone Freq/Privacy Codes:
Motorola TalkAbout
Cobra
Midland
Uniden
Backcountry Access
Rockie Talkie
Rugged Radios
Note: Rugged Radios also has 13 additional Tone Codes
The following radios share the same Tone Freq/Privacy Codes with each other, but differ from those above:
Baofeng
Tetevis
Radioddity
Radio Shack
But only goes up to 38
These radios use their own code schemes that don't match up with each other or other radios:
Cherokee 465
Motorola PL
Motorola Sport
Gray shaded channels are 0.5 Watts instead of 2/5 Watts (FRS/GMRS)
Note that Channels 89-110 use a tone not used by many radios - Google AI Says it is Code 47 (which matches with Relm CTCSS Tone Code)
Gray shaded Tones are used for Channels 23+