Few Toll free numbers uses your cell phone minutes when you call. The cell phone carriers don't care who or what you're calling. The second your phone starts dialing out, your minutes are ticking away. When you place a call (even to a toll free number) you're using your provider's service, tower, etc.

1. Improve customer satisfaction
2. Easy to remember
3. Credibility
4. Portability
5. Marketing Tool

unker is lazy to explain the detail. go search yourself

The number is easy to remember, marketing can use it to their advantage easily, the number can be used no matter where the office location is, the number is the same for all the service available to the customers.

Also, no other countries specifically didnt charge toll free number, except for landline. That is very much dependent on their telco policies

the number can be used no matter where the office location is. Can the 03,04,05 or whatever those localized number be used after you relocate your office to another state?

Yes there is, but that will just add more hassle to bridge the connection. 1 number to all is the easiest way to go.