Most recent HTC phones support rSAP without an additional app.
For HTC phones there exist 3 basically different rSAP system files. The "native" solution only works on older, usually single core phones. On later dual-core phones the "generic" solution may work. This only supports GSM SIM access. Many recent HTC phones feature a Qualcomm CPU that is compatible with the generic Qualcomm system files. Be sure to test compatibility with your phone with the free trial version!
|Support rSAP out of the box
(with HTC ROM
- not with AOSP ROM!)
|One (m8) - since Android 4.4
One (m7) - since Android 5.0
|Compatible Using "Native" System Files
Desire Z (G2)
HD2 (Leo) - after flashing Android!
|Compatible Using "Generic" System Files (GSM-only)
One S (villec2)
|Compatible Using Generic Qualcomm System Files
|One S (ville, not villec2)
One Mini (m4)
|Should be compatible
(Not yet confirmed. Please tell me if you could successfully run the trial app!)
HTC ROMs before Android 4.0 and the recent phones use the old Broadcom Bluetooth stack. Some phones with 4.0 and 4.1 use the BlueZ stack. Starting with 4.3 the new Broadcom stack is used.