A method for availing at least one data service by a user equipment, the method being performed by the user equipment, the method comprising: - transmitting an attach request to a second network in an event the user equipment is in an international roaming, wherein the user equipment is configured with a subscriber identity module SIM having a home international mobile subscriber identity IMSI and a global IMSI, the second network belongs to a foreign location, and the attach request comprises one of the home IMSI and the global IMSI; - receiving one of a rejection message and an acceptance message from the second network, wherein the rejection message is received in an event the attach request comprises the home IMSI and the home IMSI is absent in a subscriber list of the second network, and the acceptance message is received in an event the attach request comprises the global IMSI; - establishing a connection between the user equipment and the second network in an event the acceptance message is received; - extracting an IP multimedia private identity IMPI from the SIM, wherein the IMPI contains the home IMSI; - extracting at least one network parameter from the home IMSI contained in the IMPI; - identifying at least one configuration parameter, of a home network, corresponding to the at least one network parameter, wherein the at least one configuration parameter and the at least one network parameter are preconfigured in the user equipment and wherein the at least one configuration parameter comprises an access point name APN; - transmitting the at least one configuration parameter to the second network; and - availing the at least one data service using the at least one configuration parameter in an event the second network in coordination with the home network authenticates a subscriber having the at least one configuration parameter. - transmitting an attach request to a second network in an event the user equipment is in an international roaming, wherein the user equipment is configured with a subscriber identity module SIM having a home international mobile subscriber identity IMSI and a global IMSI, the second network belongs to a foreign location, and the attach request comprises one of the home IMSI and the global IMSI; the user equipment is configured with a subscriber identity module SIM having a home international mobile subscriber identity IMSI and a global IMSI, the second network belongs to a foreign location, and the attach request comprises one of the home IMSI and the global IMSI; - receiving one of a rejection message and an acceptance message from the second network, wherein the rejection message is received in an event the attach request comprises the home IMSI and the home IMSI is absent in a subscriber list of the second network, and the acceptance message is received in an event the attach request comprises the global IMSI; the rejection message is received in an event the attach request comprises the home IMSI and the home IMSI is absent in a subscriber list of the second network, and the acceptance message is received in an event the attach request comprises the global IMSI; - establishing a connection between the user equipment and the second network in an event the acceptance message is received; - extracting an IP multimedia private identity IMPI from the SIM, wherein the IMPI contains the home IMSI; - extracting at least one network parameter from the home IMSI contained in the IMPI; - identifying at least one configuration parameter, of a home network, corresponding to the at least one network parameter, wherein the at least one configuration parameter and the at least one network parameter are preconfigured in the user equipment and wherein the at least one configuration parameter comprises an access point name APN; - transmitting the at least one configuration parameter to the second network; and - availing the at least one data service using the at least one configuration parameter in an event the second network in coordination with the home network authenticates a subscriber having the at least one configuration parameter.