Whats the difference between 2 lines and double dialing in a phone?

Question

In landline phones

whats the difference between a double dialing phone and a 2 LINE phone??

are these both same or they are different

Answer 1

i never heard of double dialling phones

2 Line phone is a phone in which two independent dial tones are connected and user can select either of them. if you want to call it double dialling phone well that is your choice.