I have set up ADSL in a Spanish property that has a single pulse dial telephone. A DSL splitter has been used, and both the telephone and ADSL work. ADSL speed in this area is poor anyway, so its difficult to get a factual answer by experimentation.
The ADSL speeds in the property are simply awful, and connectivity to ADSL is also sporadic. Having removed the phone and tested speeds without it, there doesn't appear to be a massive difference, so this question is more a theoretical one.
Therefore, could a pulse dial phone negatively affect ADSL connectivity/reliability?
I'm trying to remove all potential issues before I approach the ISP, to avoid any engineer charges.