Besides the regular lanlines being operated by BSNL, you have Tata Indicom which offers cellular services, WLL lines and CDMA telephones. The number 55***** which you have mentioned is a Tata WLL line. You cannot send SMS to these phones. BSNL recently launched it\'s mobile service 9440*****. You can send an sms to these phones. Try sending a regular sms from ur mobile if possible. To send an sms to a hutch mobile, send an email...eg.
9885098850@south.hutch.co.inOther than this , we also have Airtel which is a cellular service provider.