{"id":18571,"date":"2026-09-22T01:17:20","date_gmt":"2026-09-21T18:17:20","guid":{"rendered":"https:\/\/useful.vn\/?p=18571"},"modified":"2026-09-22T01:17:20","modified_gmt":"2026-09-21T18:17:20","slug":"nhieu-smartphone-4g-khong-the-goi-thoai-khi-mang-2g-dung-hoat-dong","status":"publish","type":"post","link":"https:\/\/useful.vn\/?p=18571","title":{"rendered":"Nhi\u1ec1u smartphone 4G kh\u00f4ng th\u1ec3 g\u1ecdi tho\u1ea1i khi m\u1ea1ng 2G d\u1eebng ho\u1ea1t \u0111\u1ed9ng"},"content":{"rendered":"
\n

\nNhi\u1ec1u smartphone 4G kh\u00f4ng th\u1ec3 g\u1ecdi tho\u1ea1i khi m\u1ea1ng 2G d\u1eebng ho\u1ea1t \u0111\u1ed9ng <\/h1>\n

Vi\u1ec7c t\u1eaft s\u00f3ng 2G c\u00f3 th\u1ec3 khi\u1ebfn nh\u1eefng smartphone thi\u1ebfu VoLTE kh\u00f4ng th\u1ec3 nghe g\u1ecdi \u0111i\u1ec7n tho\u1ea1i, g\u1ed3m c\u1ea3 nh\u1eefng m\u00e1y c\u00f3 h\u1ed7 tr\u1ee3 4G.<\/p>\n

Trong m\u1ed9t s\u1ed1 h\u1ed9i nh\u00f3m v\u1ec1 \u0111i\u1ec7n tho\u1ea1i c\u0169 tr\u00ean Facebook, nhi\u1ec1u ng\u01b0\u1eddi ph\u00e0n n\u00e0n b\u1eaft \u0111\u1ea7u g\u1eb7p v\u1ea5n \u0111\u1ec1 khi nghe, g\u1ecdi d\u00f9 m\u00e1y v\u1eabn c\u00f3 s\u00f3ng v\u00e0 truy c\u1eadp Internet b\u00ecnh th\u01b0\u1eddng.<\/p>\n

Ph\u1ea1m V\u00e2n, \u0111ang s\u1eed d\u1ee5ng BlackBerry KeyOne, cho bi\u1ebft chi\u1ebfc \u0111i\u1ec7n tho\u1ea1i t\u00e1m n\u0103m tu\u1ed5i c\u1ee7a anh v\u1eabn v\u00e0o Internet v\u00e0 s\u1eed d\u1ee5ng c\u00e1c \u1ee9ng d\u1ee5ng b\u00ecnh th\u01b0\u1eddng. Tuy nhi\u00ean, t\u1eeb \u0111\u1ea7u th\u00e1ng 8, ch\u1ee9c n\u0103ng nghe g\u1ecdi b\u1eaft \u0111\u1ea7u c\u00f3 v\u1ea5n \u0111\u1ec1, kh\u00f4ng th\u1ec3 nh\u1eadn v\u00e0 th\u1ef1c hi\u1ec7n cu\u1ed9c g\u1ecdi. Nguy\u00ean nh\u00e2n sau \u0111\u00f3 \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh l\u00e0 do s\u00f3ng 2G trong khu v\u1ef1c \u0111\u00e3 t\u1eaft, trong khi m\u1eabu \u0111i\u1ec7n tho\u1ea1i nhi\u1ec1u n\u0103m tu\u1ed5i kh\u00f4ng h\u1ed7 tr\u1ee3 nghe g\u1ecdi tr\u00ean m\u1ea1ng 4G.<\/p>\n

“T\u00f4i \u0111\u00e3 th\u1eed l\u00e0m theo c\u00e1c m\u1eb9o \u0111\u1ec3 k\u00edch ho\u1ea1t VoLTE nh\u01b0ng th\u1ef1c t\u1ebf m\u00e1y kh\u00f4ng h\u1ed7 tr\u1ee3. C\u00f3 l\u1ebd \u0111\u00e3 \u0111\u1ebfn l\u00fac cho chi\u1ebfc \u0111i\u1ec7n tho\u1ea1i n\u00e0y ‘ngh\u1ec9 h\u01b0u'”, anh n\u00f3i.<\/p>\n

\n
\n<\/div>
\n

M\u1ed9t chi\u1ebfc BlackBerry KeyOne. \u1ea2nh: Ng\u1ecdc Th\u1eafng<\/em><\/p>\n<\/figcaption><\/figure>\n

Theo l\u1ed9 tr\u00ecnh, t\u1eeb ng\u00e0y 15\/9, m\u1ea1ng 2G s\u1ebd d\u1eebng ph\u00e1t s\u00f3ng tr\u00ean ph\u1ea1m vi to\u00e0n qu\u1ed1c, tr\u1eeb m\u1ed9t s\u1ed1 khu v\u1ef1c \u0111\u1eb7c th\u00f9. Th\u1ef1c t\u1ebf, qu\u00e1 tr\u00ecnh t\u1eaft 2G \u0111\u00e3 \u0111\u01b0\u1ee3c c\u00e1c nh\u00e0 m\u1ea1ng b\u1eaft \u0111\u1ea7u tri\u1ec3n khai t\u1eebng b\u01b0\u1edbc theo khu v\u1ef1c. Ch\u1eb3ng h\u1ea1n Viettel cho bi\u1ebft m\u1ed9t s\u1ed1 tr\u1ea1m 2G \u1edf nh\u1eefng khu v\u1ef1c \u0111\u00e1p \u1ee9ng \u0111i\u1ec1u ki\u1ec7n chuy\u1ec3n \u0111\u1ed5i \u0111\u00e3 \u0111\u01b0\u1ee3c t\u1eaft. C\u00f3 ngh\u0129a, m\u1ed9t s\u1ed1 kh\u00e1ch h\u00e0ng c\u00f3 th\u1ec3 b\u1ecb \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn d\u1ecbch v\u1ee5 tho\u1ea1i s\u1edbm h\u01a1n m\u1ed1c 15\/9 n\u1ebfu thi\u1ebft b\u1ecb ho\u1eb7c thu\u00ea bao ch\u01b0a s\u1eb5n s\u00e0ng.<\/p>\n

C\u00e1c nh\u00e0 m\u1ea1ng c\u0169ng c\u1ea3nh b\u00e1o vi\u1ec7c n\u00e0y t\u00e1c \u0111\u1ed9ng \u0111\u1ebfn c\u1ea3 nh\u1eefng m\u1eabu \u0111i\u1ec7n tho\u1ea1i th\u00f4ng minh, c\u00f3 k\u1ebft n\u1ed1i Internet thay v\u00ec ch\u1ec9 c\u00e1c \u0111i\u1ec7n tho\u1ea1i 2G only nh\u01b0 trong \u0111\u1ee3t ng\u1eebng d\u1ecbch v\u1ee5 n\u0103m 2024.<\/p>\n

V\u00ec sao \u0111i\u1ec7n tho\u1ea1i 4G v\u1eabn c\u00f3 th\u1ec3 b\u1ecb \u1ea3nh h\u01b0\u1edfng?<\/strong><\/p>\n

Theo k\u1ef9 thu\u1eadt vi\u00ean c\u1ee7a m\u1ed9t nh\u00e0 m\u1ea1ng, nhi\u1ec1u smartphone hi\u1ec3n th\u1ecb 4G v\u00e0 truy c\u1eadp Internet b\u00ecnh th\u01b0\u1eddng nh\u01b0ng khi th\u1ef1c hi\u1ec7n ho\u1eb7c nh\u1eadn cu\u1ed9c g\u1ecdi, thi\u1ebft b\u1ecb v\u1eabn chuy\u1ec3n xu\u1ed1ng m\u1ea1ng 2G \u0111\u1ec3 duy tr\u00ec k\u1ebft n\u1ed1i tho\u1ea1i. Qu\u00e1 tr\u00ecnh n\u00e0y di\u1ec5n ra t\u1ef1 \u0111\u1ed9ng n\u00ean ph\u1ea7n l\u1edbn ng\u01b0\u1eddi d\u00f9ng kh\u00f4ng nh\u1eadn bi\u1ebft.<\/p>\n

Khi s\u00f3ng 2G kh\u00f4ng c\u00f2n, nh\u1eefng \u0111i\u1ec7n tho\u1ea1i \u0111\u00f3 c\u1ea7n th\u1ef1c hi\u1ec7n cu\u1ed9c g\u1ecdi tr\u1ef1c ti\u1ebfp tr\u00ean m\u1ea1ng 4G th\u00f4ng qua c\u00f4ng ngh\u1ec7 VoLTE (Voice over LTE). N\u1ebfu thi\u1ebft b\u1ecb kh\u00f4ng h\u1ed7 tr\u1ee3, hay t\u00ednh n\u0103ng VoLTE ch\u01b0a b\u1eadt, ho\u1eb7c thu\u00ea bao ch\u01b0a k\u00edch ho\u1ea1t d\u1ecbch v\u1ee5, ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 g\u1eb7p gi\u00e1n \u0111o\u1ea1n khi th\u1ef1c hi\u1ec7n ho\u1eb7c nh\u1eadn cu\u1ed9c g\u1ecdi. \u0110\u00e2y c\u0169ng l\u00e0 m\u1ed9t trong nh\u1eefng l\u00fd do Vi\u1ec7t Nam duy tr\u00ec th\u1ebf h\u1ec7 m\u1ea1ng n\u00e0y th\u00eam hai n\u0103m \u0111\u1ec3 ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1eddi gian chuy\u1ec3n \u0111\u1ed5i.<\/p>\n

“\u0110i\u1ec7n tho\u1ea1i c\u00f3 4G ch\u01b0a \u0111\u1ed3ng ngh\u0129a c\u00f3 th\u1ec3 nghe g\u1ecdi b\u00ecnh th\u01b0\u1eddng sau khi 2G t\u1eaft”, k\u1ef9 thu\u1eadt vi\u00ean chia s\u1ebb.<\/p>\n

Theo ng\u01b0\u1eddi n\u00e0y, nh\u00f3m thu\u00ea bao ch\u1ecbu \u1ea3nh h\u01b0\u1edfng ph\u1ea7n l\u1edbn l\u00e0 ng\u01b0\u1eddi \u0111ang s\u1eed d\u1ee5ng \u0111i\u1ec7n tho\u1ea1i \u0111\u1eddi c\u0169, m\u00e1y x\u00e1ch tay ho\u1eb7c thi\u1ebft b\u1ecb kh\u00f4ng \u0111\u01b0\u1ee3c ph\u00e2n ph\u1ed1i ch\u00ednh th\u1ee9c t\u1ea1i Vi\u1ec7t Nam. V\u1edbi c\u00e1c thi\u1ebft b\u1ecb tr\u00ean, ng\u01b0\u1eddi d\u00f9ng n\u00ean ch\u1ee7 \u0111\u1ed9ng ki\u1ec3m tra kh\u1ea3 n\u0103ng g\u1ecdi tr\u00ean m\u1ea1ng 4G tr\u01b0\u1edbc khi s\u00f3ng 2G \u0111\u01b0\u1ee3c t\u1eaft.<\/p>\n

L\u00e0m sao \u0111\u1ec3 duy tr\u00ec nghe g\u1ecdi?<\/strong><\/p>\n

N\u1ebfu kh\u00f4ng th\u1ec3 s\u1eed d\u1ee5ng cu\u1ed9c g\u1ecdi tr\u00ean m\u1ea1ng 4G, ng\u01b0\u1eddi d\u00f9ng \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb ki\u1ec3m tra ba y\u1ebfu t\u1ed1, g\u1ed3m \u0111i\u1ec7n tho\u1ea1i c\u00f3 h\u1ed7 tr\u1ee3 VoLTE hay kh\u00f4ng, SIM 4G\/5G, v\u00e0 thu\u00ea bao \u0111\u00e3 \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t d\u1ecbch v\u1ee5 tho\u1ea1i tr\u00ean 4G hay ch\u01b0a.<\/p>\n

Tr\u00ean nhi\u1ec1u thi\u1ebft b\u1ecb, ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 v\u00e0o C\u00e0i \u0111\u1eb7t > M\u1ea1ng di \u0111\u1ed9ng<\/strong> ho\u1eb7c SIM v\u00e0 m\u1ea1ng di \u0111\u1ed9ng, sau \u0111\u00f3 t\u00ecm c\u00e1c t\u00f9y ch\u1ecdn nh\u01b0 VoLTE, Cu\u1ed9c g\u1ecdi VoLTE, G\u1ecdi 4G ho\u1eb7c Tho\u1ea1i v\u00e0 d\u1eef li\u1ec7u 4G. T\u00ean v\u00e0 v\u1ecb tr\u00ed c\u1ee7a t\u00ednh n\u0103ng c\u00f3 th\u1ec3 kh\u00e1c nhau t\u00f9y h\u00e3ng v\u00e0 phi\u00ean b\u1ea3n ph\u1ea7n m\u1ec1m.<\/p>\n

\n
\n<\/div>
\n

N\u00fat k\u00edch ho\u1ea1t t\u00ednh n\u0103ng VoLTE tr\u00ean m\u1ed9t \u0111i\u1ec7n tho\u1ea1i. \u1ea2nh: Thu Th\u1ee7y<\/em><\/p>\n<\/figcaption><\/figure>\n

\u0110\u1ec3 s\u1eed d\u1ee5ng t\u00ednh n\u0103ng g\u1ecdi tr\u00ean m\u1ea1ng 4G, thu\u00ea bao c\u1ea7n d\u00f9ng SIM 4G\/5G, thi\u1ebft b\u1ecb h\u1ed7 tr\u1ee3 VoLTE, b\u1eadt t\u00ednh n\u0103ng tr\u00ean \u0111i\u1ec7n tho\u1ea1i v\u00e0 \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t d\u1ecbch v\u1ee5 t\u01b0\u01a1ng \u1ee9ng. H\u1ea7u h\u1ebft nh\u00e0 m\u1ea1ng hi\u1ec7n nay \u0111\u1ec1u mi\u1ec5n ph\u00ed cho vi\u1ec7c n\u00e0y.<\/p>\n

N\u1ebfu SIM ch\u01b0a t\u01b0\u01a1ng th\u00edch, ng\u01b0\u1eddi d\u00f9ng c\u1ea7n \u0111\u1ebfn \u0111i\u1ec3m giao d\u1ecbch \u0111\u1ec3 \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 \u0111\u1ed5i SIM. Tr\u01b0\u1eddng h\u1ee3p \u0111i\u1ec7n tho\u1ea1i kh\u00f4ng h\u1ed7 tr\u1ee3, c\u1ea7n chuy\u1ec3n sang thi\u1ebft b\u1ecb 4G\/5G c\u00f3 kh\u1ea3 n\u0103ng t\u01b0\u01a1ng t\u1ef1 VoLTE. Ngo\u00e0i ra, th\u1ecb tr\u01b0\u1eddng c\u00f3 c\u00e1c \u1ee9ng d\u1ee5ng gi\u00fap nh\u1eadn cu\u1ed9c g\u1ecdi t\u1eeb m\u1ea1ng vi\u1ec5n th\u00f4ng, nh\u01b0ng nh\u1eefng gi\u1ea3i ph\u00e1p n\u00e0y \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 ch\u1ec9 n\u00ean s\u1eed d\u1ee5ng t\u1ea1m th\u1eddi.<\/p>\n

M\u1ed9t s\u1ed1 nh\u00e0 m\u1ea1ng Vi\u1ec7t Nam cho bi\u1ebft s\u1ebd r\u00e0 qu\u00e9t t\u1ef1 \u0111\u1ed9ng \u0111\u1ec3 k\u00edch ho\u1ea1t d\u1ecbch v\u1ee5 cho ng\u01b0\u1eddi d\u00f9ng. Tuy nhi\u00ean, h\u1ecd c\u0169ng khuy\u1ebfn ngh\u1ecb ng\u01b0\u1eddi d\u00e2n ch\u1ee7 \u0111\u1ed9ng ki\u1ec3m tra ho\u1eb7c \u0111\u1ebfn c\u1eeda h\u00e0ng, \u0111i\u1ec3m b\u00e1n ho\u1eb7c c\u00e1c \u0111i\u1ec3m h\u1ed7 tr\u1ee3 c\u1ee7a nh\u00e0 m\u1ea1ng.<\/p>\n

“T\u00f9y t\u1eebng tr\u01b0\u1eddng h\u1ee3p, kh\u00e1ch h\u00e0ng \u0111\u01b0\u1ee3c \u0111\u1ed5i SIM v\u00e0 ti\u1ebfp c\u1eadn ch\u01b0\u01a1ng tr\u00ecnh h\u1ed7 tr\u1ee3 thi\u1ebft b\u1ecb ph\u00f9 h\u1ee3p \u0111\u1ec3 duy tr\u00ec li\u00ean l\u1ea1c”, nh\u00e0 m\u1ea1ng Viettel cho bi\u1ebft.<\/p>\n

Vi\u1ec7c d\u1eebng m\u1ea1ng 2G l\u00e0 b\u01b0\u1edbc \u0111i \u0111\u00e3 \u0111\u01b0\u1ee3c \u0111\u01b0a ra nhi\u1ec1u n\u0103m, nh\u1eb1m gi\u1ea3i ph\u00f3ng t\u00e0i nguy\u00ean t\u1ea7n s\u1ed1 cho c\u00e1c c\u00f4ng ngh\u1ec7 di \u0111\u1ed9ng th\u1ebf h\u1ec7 m\u1edbi, n\u00e2ng cao hi\u1ec7u qu\u1ea3 s\u1eed d\u1ee5ng h\u1ea1 t\u1ea7ng v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng d\u1ecbch v\u1ee5, \u0111\u1ed3ng th\u1eddi th\u00fac \u0111\u1ea9y qu\u00e1 tr\u00ecnh chuy\u1ec3n d\u1ecbch ng\u01b0\u1eddi d\u00f9ng l\u00ean m\u00f4i tr\u01b0\u1eddng 4G\/5G. B\u0103ng t\u1ea7n d\u00f9ng cho m\u1ea1ng 2G tr\u01b0\u1edbc \u0111\u00e2y s\u1ebd \u0111\u01b0\u1ee3c d\u00f9ng cho m\u1ea1ng 5G ho\u1eb7c 6G trong th\u1eddi gian t\u1edbi.<\/p>\n

L\u01b0u Qu\u00fd – \u0110an Khu\u00ea<\/strong><\/p>\n<\/article>\n

\n

https:\/\/vnexpress.net\/nhieu-smartphone-4g-khong-the-goi-thoai-khi-mang-2g-dung-hoat-dong-5113692.html<\/p>\n","protected":false},"excerpt":{"rendered":"

Nhi\u1ec1u smartphone 4G kh\u00f4ng th\u1ec3 g\u1ecdi tho\u1ea1i khi m\u1ea1ng 2G d\u1eebng ho\u1ea1t \u0111\u1ed9ng Vi\u1ec7c t\u1eaft s\u00f3ng 2G c\u00f3 th\u1ec3 khi\u1ebfn nh\u1eefng smartphone thi\u1ebfu VoLTE kh\u00f4ng th\u1ec3 nghe g\u1ecdi \u0111i\u1ec7n tho\u1ea1i, g\u1ed3m c\u1ea3 nh\u1eefng m\u00e1y c\u00f3 h\u1ed7 tr\u1ee3 4G. Trong m\u1ed9t s\u1ed1 h\u1ed9i nh\u00f3m v\u1ec1 \u0111i\u1ec7n tho\u1ea1i c\u0169 tr\u00ean Facebook, nhi\u1ec1u ng\u01b0\u1eddi ph\u00e0n n\u00e0n b\u1eaft \u0111\u1ea7u<\/p>\n","protected":false},"author":1,"featured_media":18572,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-18571","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cong-nghe"],"_links":{"self":[{"href":"https:\/\/useful.vn\/index.php?rest_route=\/wp\/v2\/posts\/18571","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/useful.vn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/useful.vn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/useful.vn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/useful.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=18571"}],"version-history":[{"count":0,"href":"https:\/\/useful.vn\/index.php?rest_route=\/wp\/v2\/posts\/18571\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/useful.vn\/index.php?rest_route=\/wp\/v2\/media\/18572"}],"wp:attachment":[{"href":"https:\/\/useful.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=18571"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/useful.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=18571"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/useful.vn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=18571"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}