Brazilian carrier Vivo has launched its push-to-talk (PTT) service under the name “Vivo Direto.” The service started on July 18 in Rio de Janeiro and one month before in Porto Alegre and Curitiba cities. Although similar to Nextel‘s offering, Vivo’s PTT is based on GSM technology (3G and EDGE) instead of the iDEN standard used…….
Brazilian carrier Vivo launches PTT and faces Nextel
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