Chon dien thoai 3G ra sao

Thứ tư, 21 Tháng mười 2009, 22:59 GMT+7

Nhu vay, mang 3G da chinh thuc noi loi chao den thi truong Viet Nam . Neu ban da co y dinh su dung mang bang thong rong 3G thi viec lua chon mot chiec dien thoai phu hop va toi uu la rat can thiet. Mot so goi y duoi day se giup ban chon duoc mot trong nhung chiec dien thoai nhu vay.


Mo ta anh.
Nhung chiec dien thoai man hinh lon thich hop cho nhu cau xem video di dong.



Nhin chung, bang tan va toc do truy cap mang 3G la yeu to dau tien nhan biet va lua chon dong dien thoai nay. Chung toi con liet ke mot so nhu cau binh thuong de ban uu tien su dung tinh nang nao tren dien thoai 3G. Ngoai ra, con rat nhieu yeu to khac khi ban lua chon nhung mau dien thoai nhu vay.

Lua theo bang tan

Tai Viet Nam, theo cam ket cua Viettel, bang thong mang 3G cua ho co the len den 7,2Mbps. Con VinaPhone trong ngay cong bo 12/10 tai Ha Noi, ho cam ket duong truyen du lieu va truy cap internet toc do toi da len toi 14,4Mbps. Chinh vi the neu ban co dieu kien hay dau tu nhung mau dien thoai co toc do cao nhu the de toi uu viec su dung mang 3G.


Chiec dien thoai 3G dau tien cua Nokia mang so hieu 6650 voi man hinh mau 4.096 mau, bo nho trong 7MB, may chup anh VGA. Chiec may nay khong ho tro EDGE nhung lai ho tro mang 3G UMTS 2100MHz, toc do truy cap 348Kbps. Hien Nokia co mau dien thoai 3G la 2730 classic hoat dong tren bang tan 900/2100MHz cung toc do truy cap mang 348Kbps. Neu toc do 3G cua cac nha mang thuc te luon dat tren muc nay thi day la mot giai phap dau tu tiet kiem, toc do nhinh mang EDGE mot chut. Vi ly thuyet, EDGE cung dat toc do truy cap den muc 348Kbps. Gia cua 2730 dao dong trong khoang 1,8 trieu dong. Tuy nhien, mot so model da chuc nang co muc gia kha cao nhu Nokia E63 co gia len toi 4,7 trieu dong.


Len den toc do truy cap 3,6Mbps voi mang HSDPA, ban se lua chon nhung mau dien thoai trong khoang tu 2,6 trieu dong tro len. Chang han nhu Samsung U800 Soul b (2,6 trieu dong), Sony Ericsson T700 (3,7 trieu dong). Cung co mot vai san pham co gia gan chuc trieu nhu Nokia N96 co gia 9,7 trieu dong.


Len den toc do 7,2Mbps, ban co kha it lua chon va phai chi tra kha nhieu tien cho viec so huu nhung model nay. Gia hop ly nhat la chiec Nokia E52, san pham nay co toc do truy xuat mang HSDPA len toi muc 10,2Mbps. Cac san pham con lai thuoc dong Nokia E-series moi nhu E55, E72 cung deu co toc do tuong tu, Samsung Ultra Touch S8300 (7,9 trieu dong), Sony Ericsson W705 (7,2 trieu dong) co toc do 7,2Mbps.

Dam thoai video call (thoai thay hinh)

Co nhung dien thoai ho tro 3G nhung lai khong duoc tich hop camera danh cho tinh nang dam thoai nay. Neu ban nhan thay tinh nang thu vi nay la phu hop voi minh thi hay luu y mot vai yeu to duoi day.


Hau het cac camera phia truoc cua dien thoai 3G deu co do phan giai duoi VGA (640 x 480 pixel), tot nhat khi su dung ban chon thiet lap tuong ung theo do phan giai man hinh hoac nho hon. Chang han nhu do phan giai 240 x 320 pixel, 176 x 208 pixel,... Mot so may dien thoai 3G tich hop camera phia truoc cua Nokia cung duoc tich hop den LED tro sang de su dung trong moi truong toi.


Voi nhung mau dien thoai voi mot camera duy nhat (o dang xoay da chieu) vua su dung de chup anh, vua dung lam dam thoai video 3G, ban cung nho luu y yeu to do phan giai khi dam thoai de tranh truong hop video bi “giat” khi trinh chieu. Voi loa ngoai speaker phone thi day la thanh phan khong the thieu duoc o nhung may duoc ho tro tinh nang dam thoai nay. Vi ban phai de dien thoai xa khoi tai thi moi de nguoi ben kia thay minh, cung nhu ban quan sat duoc nguoi ben kia, khi do thi mot chiec loa ngoai tot la rat can thiet.

Luot web
Tan dung toi da duong truyen 3G tuc la ban se luot web nhanh hon mang EDGE/GPRS. Nhung chiec dien thoai co man hinh tot nhu iPhone 3G cung trinh duyet sieu toc Safari la lua chon tieu bieu cho dien thoai 3G chuyen luot web.


Tuy nhien trinh duyet cua Apple lai khong ho tro Flash, day la han che cho den thoi diem bay gio cua Apple. Voi trinh duyet tren Google Android (HTC Hero), flash da duoc tich hop nen ban co the xem video Flash hay youtube truc tiep tren trinh duyet (tuong tu nhu mot so he dieu hanh nhu Symbian).


Tren thuc te, cac may dung he dieu hanh Android va iPhone co toc do duyet web rat tot. Nhung dieu nay khong co nghia la ban phai doi chiec dien thoai dang dung sang mot may khac, ma ban nen chu trong den cac tinh nang minh hay dung de quyet dinh mua may cho hop ly. Mot chiec dien thoai thong minh voi man hinh lon cung du cho nhu cau luot web, du chung la model gi cua bat ky hang nao.

Xem Mobile TV, video truc tuyen


He dieu hanh Symbian voi RealPlayer cho phep phat truc tiep Mobile TV dang Streaming. Voi nhung thiet bi man hinh lon nhu Nokia N97, Nokia 5800,... thuc su ly tuong cho viec thuong thuc viec nay. Ngoai ra mot so he dieu hanh dien thoai khac nhu Windows Mobile cung ho tro rat tot Mobile TV.


Voi iPhone 3G, nguoi dung phai vao Cydia, tim va cai dat phan mem Streamer, sau do bookmark trong trinh duyet dia chi xem Mobile TV moi co the su dung duoc.

Dung lam modem voi PC

Cho den nay, ly do doc quyen cua AT&T trong viec phan phoi iPhone da khien chiec dien thoai nay khong the dung lam modem ket noi 3G voi PC. Neu su dung iPhone lam access point phat Wi-Fi truy cap 3G se rat ngon pin.

Nhung mau dien thoai cua Nokia, Samsung, Sony Ericsson voi trinh quan ly PC Suite kem theo may deu co tinh nang ket noi internet su dung cho may tinh tren he dieu hanh Windows. Viec ket noi bang cap USB voi mot so may co the phuc hoi lai nang luong cho dien thoai bang tinh nang sac truc tiep. Khi ket noi qua Bluetooth, voi ly thuyet khoang 2,1Mbps (Bluetooth 2.1) thi toc do su dung chac chan se khong duoc dam bao vi bang thong cua HSDPA len den 7,2Mbps.

Cac tac vu khac

Nhung thanh phan nhu ban phim QWERTY, may chup anh, toc do hoat dong may cao voi phan cung manh, GPS, thiet ke thoi trang,... cung la nhung yeu to quyet dinh trong viec lua chon mot chiec dien thoai 3G.

(Duc An/eCHIP)



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