This trick will help you setup a Birthday reminder for all your Orkut Friends on your Mobile using Google Calenders. Below are the few steps to do this:]
Step1:
Log on into your Orkut Account.
Step 2:
Now in a new tab, Go to Google .com
Step 3:
On the Top-Right end, you can see "My Account". Click on it.

Step 3:
Click on Calenders.

When you click on calenders, it will ask you to add orkut friends birthday to google calender. Accept it.
Step 4:
Now on the top-right end click on settings.

Step 5:
On this window, Click on Mobile Setup.

Step 6:
Now, Enter your mobile number in the space given and veryfy your Mobile Number.

Thats all, Now whenever there comes a birthday of your friend, you will get a reminder on your Mobile.
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