I can put any ANY/CLI (it's a phone number of calling person), so basically speaking your idea is not working.
Same for long numbers and SMS sent by user to this number - I can put ANY phone number as a sender.
You can pay for short numbers (free for user), but it will require to get them in EACH country.
I can put any ANY/CLI (it's a phone number of calling person), so basically speaking your idea is not working. Same for long numbers and SMS sent by user to this number - I can put ANY phone number as a sender.
You can pay for short numbers (free for user), but it will require to get them in EACH country.