Can I answer a call on my smartphone if the program is running or will this interrupt the program?

Can I answer a call on my smartphone if the program is running or will this interrupt the program?

Yes, you can! The program is running on the Healy, not on your smartphone; the latter is only used to tell Healy which program to run. So once the program is transmitted to Healy and started (and the intensity is adjusted), the smartphone is no longer required.