Its very simple to activate the voice mail button on your iPhone to use with any carrier in India. Follow these steps do this
Step 1: Type in the following code in your iPhone’s keypad
*5005*86*XXXXX#
Here replace XXXXX with your carriers voicemail number.
For example, for Tata Docomo Chennai replace XXXXX with 09029090290.
For Vodafone Mumbai, replace XXXXX with 51234
***Please visit your carrier’s website to find out your voicemail number
Step 2: Press the call button. That’s all; the code will be set
Step 3: Now press the Voicemail button and the iPhone will take you directly to your voicemail
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