Is I phone 4S - IPhone 5 CDMA compatible with Reliance CDMA service in Mumbai India.

Sorry but no. CDMA iPhones work only with the carrier for which they are sold; Verizon or Sprint in the US, for example.

Regards.

CDMA iPhones are not portable between carriers. Reliance is not a supported carrier and is not authorized to carry the iPhone. If you want to use an iPhone, you'll need to select a different carrier.

Here is a list of supported carriers: http://support.apple.com/kb/ht1937

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