การสื่อสาร, มาร์ทโฟน, โทรศัพท์มือถือ, รายชื่อผู้ติดต่อ, เครือข่าย
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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