iPhone 8 User Manual

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Toturncellulardataandroamingonoroff,setwhichappsandservicesuse

cellulardata,seecalltimeandcellulardatausage,andsetothercellular

options,gotoSettings>Cellular.

Note:Forhelpwithcellularnetworkservices,voicemail,andbilling,contact

yourwirelessserviceprovider.

IfiPhoneisconnectedtotheInternetviathecellulardatanetwork,theLTE,4G,

3G,E,orGPRSiconappearsinthestatusbar.

LTE,4G,and3GserviceonGSMcellularnetworkssupportsimultaneous

voiceanddatacommunications.Forallothercellularconnections,youcan’t

useInternetserviceswhileyou’retalkingonthephoneunlessiPhonealsohas

aWi-FiconnectiontotheInternet.Dependingonyournetworkconnection,you

maynotbeabletoreceivecallswhileiPhonetransfersdataoverthecellular

network—whendownloadingawebpage,forexample.

GSMnetworks:OnanEDGEorGPRSconnection,incomingcallsmaygo

directlytovoicemailduringdatatransfers.Forincomingcallsthatyou

answer,datatransfersarepaused.

CDMAnetworks:OnEV-DOconnections,datatransfersarepausedwhen

youanswerincomingcalls.On1xRTTconnections,incomingcallsmaygo

directlytovoicemailduringdatatransfers.Forincomingcallsthatyou

answer,datatransfersarepaused.

Datatransferresumeswhenyouendthecall.

IfCellularDataisoff,alldataservicesuseonlyWi-Fi—includingemail,web

browsing,pushnotifications,andotherservices.IfCellularDataison,carrier

chargesmayapply.Forexample,usingcertainfeaturesandservicesthat

transferdata,suchasSiriandMessages,couldresultinchargestoyourdata

plan.

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User Manual - Page 472