How to appear to call from a fake phone number?

Wanna prank your friends calling from their dad's phone number?
Here's an app that lets you choose your own caller ID.

It's​ called Fake Call by BitWarp Developments. You can get the app from play store.

So first, open the app then choose your caller ID followed by your friend's number and place the call. Your friend will see your desired caller ID in his phone.

This app gives only a small credit which lets you talk only for 5 to 8 seconds for free. You have to buy credits to talk more.

However there's another way to get credits for free but this only lets you talk only upto about  8 seconds at once. You need a app called Parallel Space. What this app does is just creates new cache for apps so that the apps 'think' that they are used for the first time in your device. In Parallel Space, add this app and you get those credits once again. After exhausting those, just remove the app from Parallel Space and then add it again, you get another sum of credits.

You can't talk to your friends for long time  with this provided you genuinely spend real world money for it. However it's a nice prank just to show your friend that someone undesirable is calling them.

I played this trick on our Zoology miss. I called her from our chairman's phone number at 11 o clock at night. I didnt say anything just hung up. She called back to chairman's number and it caused a lot of ridicule the next day. Of course Miss knew that it could be done only by me. #LOL. She called me and asked me about it. I admitted it. There was a lot of fun. She called me 'badmash' which I always love to hear from her.

The app also has an option to change your voice which can be useful. So that's how we do it.