A method of communication, comprising: receiving at an access terminal an indication from a home operator entity for the access terminal via a network connection to dynamically configure the access terminal, wherein the indication has two possible designated values, wherein the first value of the indication indicates that a message service is preferred to be invoked over Internet Protocol Multimedia Subsystem, IMS, signaling and wherein the second value of the indication indicates that the message service is to be invoked over non-access stratum, NAS, signaling; maintaining the indication at the access terminal; attempting to deliver message service information based on the indication; wherein, when the access terminal is already attached to evolved packet system, EPS, services, attempting to deliver the message service information comprises: attempting to deliver the message service information over IMS signaling if the indication indicates that the message service is preferred to be invoked over IMS signaling; and attempting to deliver the message service information over NAS signaling if the attempt to deliver the message service information over IMS signaling fails, wherein attempting to deliver the message service information over NAS signaling comprises: determining whether an international mobile subscriber identity, IMSI, attach has already been attempted; if an IMSI attach has not yet been attempted, attempting to register to the NAS domain via a combined tracking area update with IMSI attach; and if an IMSI attach has already been attempted and has failed, determining that the message service is not available. receiving at an access terminal an indication from a home operator entity for the access terminal via a network connection to dynamically configure the access terminal, wherein the indication has two possible designated values, wherein the first value of the indication indicates that a message service is preferred to be invoked over Internet Protocol Multimedia Subsystem, IMS, signaling and wherein the second value of the indication indicates that the message service is to be invoked over non-access stratum, NAS, signaling; maintaining the indication at the access terminal; attempting to deliver message service information based on the indication; wherein, when the access terminal is already attached to evolved packet system, EPS, services, attempting to deliver the message service information comprises: attempting to deliver the message service information over IMS signaling if the indication indicates that the message service is preferred to be invoked over IMS signaling; and attempting to deliver the message service information over NAS signaling if the attempt to deliver the message service information over IMS signaling fails, wherein attempting to deliver the message service information over NAS signaling comprises: attempting to deliver the message service information over IMS signaling if the indication indicates that the message service is preferred to be invoked over IMS signaling; and attempting to deliver the message service information over NAS signaling if the attempt to deliver the message service information over IMS signaling fails, wherein attempting to deliver the message service information over NAS signaling comprises: determining whether an international mobile subscriber identity, IMSI, attach has already been attempted; if an IMSI attach has not yet been attempted, attempting to register to the NAS domain via a combined tracking area update with IMSI attach; and if an IMSI attach has already been attempted and has failed, determining that the message service is not available. <EOS>