Yu (Essar) Kenya mobile service provider has a Ring-back Tone (RBT) service which allows its subscribers to have an audible ringing tone heard by their callers prior to the call being answered. Dunda ring back tone replaces the default tone with your favorite chosen tone.  
 Yu Dunda Ring back tone service allows subscribers to have different ring back tunes placed on particular callers; it helps to place a ring back tone to callers depending on their characteristics, likes and dislikes. Religion is a very sensitive phenomenon hence it would not be wise to place a ring back tone which is conflicting to a friend’s religious beliefs.  

How to get a Yu Dunda caller ring back tone by text message;
1.      Send a text message with the following format CT[SPACE] songcode to 850 i.e. CT 80003
2.      After sending the text message, you will automatically be registered to the Yu Dunda caller ring back tone service.
3.      Registration costs a nominal fee of Kshs.10
4.      Each tone download costs Kshs.15
5.      If you wish to have more songs, you can download as many as you wish and they will be played randomly for your callers.

How to get a Yu Dunda caller ring back tone by Interactive Voice Response

1.      To get  a Yu Dunda caller ring back tone by interactive voice response, call 850
2.      Registration costs a nominal fee of Kshs.10
3.      Each tone download costs Kshs.15
4.      If you wish to have more songs, you can download as many as you wish and they will be played randomly for your callers.

USSD Code
·        On your mobile handset, dial *850# to access.