It’s quite difficult to buy a smart phone in Daegu due to the language problem.
One of my friends introduced Boondo Telecom (a mobile phone store), which is near the Songhyeon Subway Station, Line 1.
The sales guy speaks English, and is kind and trustworthy.
The store also sells the Internet Broadband services.
His phone number 010 4526 7379 and his E-mail is firstname.lastname@example.org.