How do I get numbers for verifying gmail sms verification ?

How do I get numbers for verifying gmail sms verification ?

Can anyone please help if they know.If I use 1 number for 100 gmail accounts, I'm sure, google can easily track.

Just use your cellphone number. You will received the sms. I'm not sure it matters I have used 1 number for 3 different google verification but that was only 3. I'm not sure if that's the case with google when using 100. In Facebook you will need 1 number per account but I don't think it applies to google.

Actually sms numbers are costly and not easily available. try VOICE option . it appears on verification page in daytime to your location.

Best way is to setup a virtual CC, and have the balance at a dollar. Signup for 'free trial' sites for virtual phone numbers. There are plenty. Unlimted numbers for a month, some sites like evoice have a 6 month free trial. You can add 5 gmail PVAs a month to a number last time I checked.