received call from indian sounding man saying that because i had my number for a long time i was eligible to receive free android smartphone. I then hung up.

My friend says that the point of these calls is to keep you on the phone for a certain amount of time so they can then get info stored on your phone- so dont stay on abusing them or arguing with them, just hung up.

I called back number (07) 3062 2451 rang 5 times then goes to busy tone.