You get a very limited broadband connection just for the Digital Voice.
By providing broadband, albeit a version with very low bandwidth ( 0.5Mb ) download that’s priced the same as the existing standalone telephony product , the customer gets a ‘router’ wether that’s a standard SH2 or a ‘cut down’ version that has no broadband facilities, WiFi , Ethernet ports etc , remains to be seen.
AFAIK , no BT customer has posted on this forum of having this phone only service provided in a FTTP home , but Openreach have a FTTC/FTTP 0.5Mb profile for this purpose , TBH there’s not likely to be many takers , it’s much more likely customers don’t want telephony but do want broadband