Google asking Mobile number to activate my Gmail account . Please HELP

Google is now start asking your mobile number for the activation purpose. After filling the Gmail Application Form you will be redirected to new page asking your mobile number for activation purpose. After entering your mobile number you will click ?Send Activation Code to my mobile phone? option and they will send activation code to your mobile phone within a second you need to enter that code in next step otherwise you will not able to Login Gmail account. It shows like this image after login

I have a service of Google Plus Marketing. So I need to use A lot of Gmail accounts. An that's why I need a bulk phone numbers. But You know it's very costly to buy a bulk phone number. I will very great full to you if anybody can help me to find the method to verify my bulk Gmail. I don't mind if you want some payment for this.
NB: Now a days K7, Phone (dot) com even Google voice doesn't work for Gmail Verification.

didn't you say you have a method for unlimited phone verification?

There are other alternatives to K7 that still works

give them phone no