A wireless Push-to-Talk, PTT, communication system comprising: a) a plurality of mobile wireless PTT communications devices (12a-12d), each configured to send a PTT call request; b) a wireless network coupling said plurality of mobile wireless PTT communications devices (12a-12d); and c) a PTT server configured to (i) when a number of said plurality of mobile wireless PTT communications devices (12a-12d) in a given talkgroup is greater than or equal to a first threshold, then cause each mobile wireless PTT communications device (12a-12d) of the given talkgroup to report a respective location, so that the PTT server knows when it is appropriate to issue multicast bearer services; (ii) when the number of said plurality of mobile wireless PTT communications devices (12a-12d) in the given talkgroup is less than the first threshold, then disable each mobile wireless PTT communications device (12a-12d) of the given talkgroup from reporting the respective location; and (iii) when the number of mobile wireless PTT communications devices (12a-12d) of the given talkgroup within a set geographic area is greater than or equal to a second threshold, then configure said wireless network to provide multicast bearer services for the given talk group within the set geographic area. a) a plurality of mobile wireless PTT communications devices (12a-12d), each configured to send a PTT call request; b) a wireless network coupling said plurality of mobile wireless PTT communications devices (12a-12d); and c) a PTT server configured to (i) when a number of said plurality of mobile wireless PTT communications devices (12a-12d) in a given talkgroup is greater than or equal to a first threshold, then cause each mobile wireless PTT communications device (12a-12d) of the given talkgroup to report a respective location, so that the PTT server knows when it is appropriate to issue multicast bearer services; (ii) when the number of said plurality of mobile wireless PTT communications devices (12a-12d) in the given talkgroup is less than the first threshold, then disable each mobile wireless PTT communications device (12a-12d) of the given talkgroup from reporting the respective location; and (iii) when the number of mobile wireless PTT communications devices (12a-12d) of the given talkgroup within a set geographic area is greater than or equal to a second threshold, then configure said wireless network to provide multicast bearer services for the given talk group within the set geographic area. (i) when a number of said plurality of mobile wireless PTT communications devices (12a-12d) in a given talkgroup is greater than or equal to a first threshold, then cause each mobile wireless PTT communications device (12a-12d) of the given talkgroup to report a respective location, so that the PTT server knows when it is appropriate to issue multicast bearer services; (ii) when the number of said plurality of mobile wireless PTT communications devices (12a-12d) in the given talkgroup is less than the first threshold, then disable each mobile wireless PTT communications device (12a-12d) of the given talkgroup from reporting the respective location; and (iii) when the number of mobile wireless PTT communications devices (12a-12d) of the given talkgroup within a set geographic area is greater than or equal to a second threshold, then configure said wireless network to provide multicast bearer services for the given talk group within the set geographic area.