less economical????????

[amulsmail]

which is less economical for the mobile service providers to deliver the response to a cusotmer 1. IVR 2. SMS 3. MMS 4. BY CALLING?

[petrib]

With "less economical for the mobile service provider" do you mean "most expensive for the service provider"?

In any case, it depends (primarily on what the response is, but also on so many other possible factors).

Why do you want to know?