6. On the listening of call features Zalo, what interest you most? (choose only 1 answer) cost of the international call listening line speed sound. other (specify). 7. Factors do you prefer not to use the messaging application, heard the call on Zalo? (can select multiple answers) leaks leak personal information calls, file photo, flie recording. spam messages, believe too many advertising not yet have online video calling feature the amount of time the nt by short video features Realtime (tn status messages received and sent). difficulty in recovering deleted messages. other (specify).
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