สัญลักษณ์ Dtac หน้าศูนย์บริการ Dtac DTAC customers at a service centre in Bangkok. The company says its entire customer base of 21 million could face mobile network problems after the 850MHz switch-off. ++++++++++++++ Published caption:: DTAC decided to bid on the second-round auction for a 900MHz licence. PORNPROM SATRABHAYA