How to change the SMSC number Android

How to change the SMSC number Android

freesmsc for android phone:

First, why do you need to change the number smsc (Short Message Service Center)?
based on my experience, Changing SMSC is required when you go to another country (for travel or travel biz) and still want to send SMS (SMS roaming). or if you want to use free smsc agat cost of your free sms. for free smsc can be viewed at free smsc