700 mins replaced 500 mins a few years ago , when PSTN was still able to be ordered , it seems that this plan (700 mins) is now only available to existing phone only customers, BT broadband customers who want telephony have to take PAYG or Unlimited Minutes.
As standalone telephony is currently pretty difficult to actually buy , with the PSTN switch off , the requirement is to take DV , the only exception being existing BT telephony only customers moving to PDPL (pre digital phone line ) so effectively the 700 mins is unavailable to anyone but them.
The only example I’ve seen recently of a new BT customer wanting telephony only was given BT broadband for free, just to run the telephone service (proper DV not PDPL) but with a warning that using BT broadband for anything other than DV ,(so basically any device connected via WiFi or Ethernet ) will be detected and taken to be a tacit agreement to accept broadband as an additional service and BT would (understandably) start to charge for it , BT can tell if there is any regular broadband traffic on that service, chances are a warning will be sent first , something along the lines of ‘we noticed you are using broadband , if you continue to do this your bill will increase accordingly ‘ but these type of customers will be pretty few and far between.
