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According to Ringbat data, +84 3520 operates within Vietnam and nearby areas.
Carrier for this prefix: "Viettel".
Ringbat database places +84 3520 at coordinates (15.9266657, 107.9650855).
These pages show detailed information for area codes, even when the full number is unknown.
Country: 🇻🇳 VN
Country Code: +84
Carrier: Viettel
Prefix: 3520
Location: Vietnam
Coords: 15.9266657, 107.9650855
Area Code Page: +84 3520
Comments: Disabled for area-code pages
Example: +84 3520 *** ***
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+84 3520 is an area code/prefix that appears to be associated with Vietnam. It may be assigned to multiple phone numbers within that region.
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Carrier information for this prefix: Viettel. In some cases multiple carriers may use similar prefixes.
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