Its an simple divert trick which was known by few out there..

STEPS:
1. Go to Divert column of ur mobile no. which will be diff. for diff. models.

2. Activate Divert for all voice calls. (If ur mobile have facility to divert a particular no. then its more better. in case only divert from that particular no. whom u wana make fool)

3. In dstination divert no enter this magic code..

Code:0000

Happy fooling and dont forget to cancel ur diverts immidiatly after this mischeivios…