Technology is for our benefit, not to be used for cyber crimes or hacking, there are many apps, using which can make the life easy, but also the vice-versa!
Many people wander how to hide their caller ID while making a phone call, if this is for fun than fine but when it is intended to make a crime, than this is inhuman!
An app which let you hide or display your caller ID to others and you also can make app to app free VoIP calls:
WePhone is an app like Skype or Viber which allows app to app (internet calling) free calls from anywhere to anywhere on WIFI or 3G etc. No roaming or overseas roaming is applied here, if someone do not have We Phone app than you can still call their phone numbers but for a payment!
|Hide or display caller ID, make, record free phone calls|
The app can even record phone calls for free over iOS or Android devices, you can hide or show your caller ID (this could be really dangerous!) in this, that is why Indian government is worried over this app usage!