cellular data current period is that download or upload
View or alter cellular data settings on iPhone
You can turn cellular data and roaming on or off, fix which apps and services use cellular information, see cellular data usage, and set other cellular information options.
Note: For help with cellular network services, voicemail, and billing, contact your wireless service provider.
If iPhone is connected to the internet using the cellular data network, an icon identifying the cellular network appears in the status bar.
5G, LTE, 4G, and 3G service on GSM cellular networks support simultaneous vocalisation and information communications. For all other cellular connections, yous can't use cyberspace 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 lot may not be able to receive calls while iPhone transfers data over the cellular network—when downloading a webpage, for example.
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GSM networks: On an EDGE or GPRS connexion, incoming calls may go directly to voicemail during data transfers. For incoming calls that you lot respond, information transfers are paused.
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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 y'all answer, data transfers are paused.
Data transfer resumes when you cease the phone call.
If Cellular Information is off, all data services—including email, spider web browsing, and push notifications—use Wi-Fi only. If Cellular Data is on, carrier charges may apply. For example, using certain features and services that transfer information, such as Siri and Messages, could result in charges to your information program.
Choose cellular information options for data usage, performance, bombardment life, and more than
To plow Cellular Data on or off, go to Settings 
> Cellular.
To prepare options when Cellular Data is on, go to Settings > Cellular > Cellular Data Options, then do whatever of the following:
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Reduce cellular usage: Turn on Depression Data Way, or tap Information Mode, so cull Low Information Manner. This manner pauses automatic updates and groundwork tasks when iPhone isn't connected to Wi-Fi.
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Turn Data Roaming on or off: Information Roaming permits internet admission over a cellular data network when y'all're in a region non covered by your carrier's network. When you're traveling, you lot tin can plough off Data Roaming to avoid roaming charges.
Depending on your iPhone model, carrier, and region, the following options may exist available:
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Turn Vox Roaming on or off: (CDMA) Plow Voice Roaming off to avoid charges from using other carrier's networks. When your carrier's network isn't available, iPhone won't have cellular (data or voice) service.
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Enable or disable 4G/LTE: Using 4G or LTE loads net data faster in some cases but may decrease bombardment operation. There may be options for turning off 4G/LTE or for selecting Voice & Data (VoLTE) or Data Only.
On iPhone 12 models and later, yous tin can practise the following:
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Enable Smart Data mode to optimize battery life: Tap Vox & Information, then choose 5G Auto. In this mode, your iPhone automatically switches to LTE when 5G speeds don't provide noticeably better functioning.
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Use higher-quality video and FaceTime HD on 5G networks: Tap Information Way, then choose Allow More Data on 5G.
Gear up a Personal Hotspot to begin sharing the cellular internet connection from iPhone
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Go to Settings
> Cellular, then turn on Cellular Data. -
Tap Ready up Personal Hotspot, then follow the instructions in Share your cyberspace connection from iPhone.
Set cellular data utilize for apps and services
Get to Settings > Cellular, so turn Cellular Data on or off for any app (such as Maps) or service (such every bit Wi-Fi Assist) that can apply cellular data.
If a setting is off, iPhone uses just Wi-Fi for that service.
Note: Wi-Fi Assist is on by default. If Wi-Fi connectivity is poor, Wi-Fi Assist automatically switches to cellular information to boost the indicate. Considering you stay connected to the internet over cellular when y'all take a poor Wi-Fi connection, you might utilise more than cellular data, which may incur additional charges depending on your data program. Come across the Apple Support commodity About Wi-Fi Assist.
Lock your SIM card
If your device uses a SIM card for phone calls or cellular data, you tin can lock the card with a personal identification number (PIN) to prevent others from using the card. And then, every time you lot restart your device or remove the SIM bill of fare, your card locks automatically, and you're required to enter your Pin. See Employ a SIM PIN for your iPhone or iPad.
Source: https://support.apple.com/en-al/guide/iphone/iph3dd5f213/ios
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