AT&T iPhone 4S vs Verizon iPhone 4S | AT&T iPhone 4S vs Verizon thiab Sprint iPhone 4S | GSM iPhone 4S vs CDMA iPhone 4S Ceev, Performance
AT&T iPhone 4S thiab Verizon iPhone 4S yog ob qho tib si tib yam ntawm iPhone 4S tam sim no nrog qhov sib txawv me ntsis vim yog lub network teeb tsa. iPhone 4S yog 3G Xov tooj, nws tsis txhawb 4G tes hauj lwm xws li LTE, WiMAX. Nws tsuas yog txhawb 2G GSM / EDGE / GPRS thiab 3G UMTS / HSPA lossis CDMA thev naus laus zis. AT&T siv 3G UMTS/HSPA+ thev naus laus zis, thaum Verizon siv CDMA thev naus laus zis. Vim qhov sib txawv ntawm kev siv tshuab network no, cov neeg siv yuav ntsib qhov sib txawv ceev thaum txuas los ntawm cov neeg nqa khoom network rau cov kev pabcuam. Sprint kuj tseem siv CDMA thev naus laus zis rau nws 3G network. Cov nqi tes ntawm tag nrho peb tus qauv yog tib yam, txawm hais tias cov ntaub ntawv npaj sib txawv ntawm tus neeg nqa khoom mus rau tus neeg nqa khoom. Ntawm daim ntawv cog lus 2 xyoo tshiab, iPhone 4S 16GB muaj rau $ 199, 32GB yog rau $ 299, thiab 64GB muaj rau $ 399.
AT&T iPhone 4S (GSM iPhone 4S)
AT&T xa tawm UMTS (Universal Mobile Telecommunication System) network rau 3G. UMTS yog tus ua tiav ntawm GSM (Lub Ntiaj Teb Txheej Txheem rau Kev Sib Txuas Lus Sib Txuas Lus) tus qauv. GSM thiab UMTS yog siv dav siv thev naus laus zis; tus naj npawb ntawm lub tebchaws siv UMTS ntau dua li cov tebchaws siv CDMA.
AT&T iPhone 4S txhawb nqa UMTS / HSDPA / HSUPA (850, 900, 1900, 2100 MHz) thiab 2G networks GSM thiab EDGE (850, 900, 1800, 1900 MHz). HSPA muaj qhov siab tshaj plaws theoretical ceev ntawm 14.4Mbps. Tab sis hauv kev xyaum, nws tsawg dua.
Verizon iPhone 4S (CDMA iPhone 4S)
Verizon siv CDMA (Code Division Multiple Access), uas tseem yog lub wireless broadband technology uas siv cov bandwidth kom zoo dua li lwm cov thev naus laus zis. CDMA siv cov xov tooj muag muag thaum koj mus ncig, thiab nws yuav tau txais cov teeb liab los ntawm ntau lub yees tib lub sijhawm thiab siv lub teeb liab muaj zog tshaj plaws.
Nyob hauv CDMA, muaj qhov sib txawv ntawm qhov ceev, vim nws nyob ntawm txoj hauj lwm, cov pej xeem ceev thiab lwm yam. Qhov tsis zoo ntawm lub xov tooj CDMA yog tias thaum koj hu lub suab koj tsis tuaj yeem xauj hauv internet; Hauv kev nkag siab, CDMA tsis muaj peev xwm nqa lub suab thiab cov ntaub ntawv ib txhij.
iPhone 4S Verizon qauv yog teeb tsa los txhawb CDMA EV-DO Rev. A (800, 1900 MHz). Verizon thov tias nws CDMA EV-DO Rev. Ib lub network muaj qhov nrawm ntawm 600 txog 1.4Mbps rau kev rub tawm, thiab qhov nrawm ntawm 500 txog 800 Kbps rau uploads. Hauv qhov chaw uas CDMA network tsis hloov kho rau EV-Do Rev. A, cov neeg siv tuaj yeem cia siab tias tsuas yog rub tawm ceev ntawm 400 txog 700 Kbps thiab upload ceev ntawm 60 txog 80 Kbps. Rau thoob ntiaj teb roaming, Verizon Wireless thoob ntiaj teb cov cuab yeej txhawb nqa cov ntaub ntawv hauv ntau dua 205 lub teb chaws, nrog rau kev nkag mus rau 3G nrawm hauv ntau dua 145 lub teb chaws.
Qhov txawv ntawm AT&T iPhone 4S thiab Verizon iPhone 4S yog dab tsi?
1. Lub Verizone iPhone 4S muaj cov yam ntxwv zoo ib yam li AT&T iPhone 4S, qhov txawv yog kev txhawb nqa network.
2. AT&T iPhone 4S txhawb UMTS/HSDPA/HSUPA (850, 900, 1900, 2100 MHz); GSM/EDGE (850, 900, 1800, 1900 MHz), whereas CDMA iPhone 4S txhawb CDMA EV-DO Rev. A (800, 1900 MHz).
3. CDMA muaj qhov muag muag ntawm kev hu xov tooj thaum tsiv thaum UMTS tsis muaj qhov tshwj xeeb no.
4. CDMA xov tooj tuaj yeem tau txais cov teeb liab los ntawm ntau lub yees thiab xaiv lub teeb liab tsim nyog.
5. UMTS cov xov tooj yuav muaj SIM lossis Micro SIM daim npav qhov twg hauv CDMA xov tooj tsis muaj SIM phaib.
6. UMTS / HSPA 3G kev sib txuas yuav nrawm dua li CDMA 3G kev sib txuas, hauv General. AT&T thov tias nws yog ob zaug sai dua CDMA tes hauj lwm hauv lub tebchaws.
7. UMTS lub xov tooj tuaj yeem nqa lub suab thiab cov ntaub ntawv ib txhij thaum hauv xov tooj CDMA nws tsis tuaj yeem siv lub suab thiab cov ntaub ntawv ib txhij
CDMA Development pab pawg tau tshaj tawm tias sai sai CDMA tes hauj lwm thiab handsets yuav nqa cov ntaub ntawv thiab lub suab ib txhij.
