View or change cellular data settings on iPhone
You can plough cellular data and roaming on or off, set which apps and services use cellular data, come across cellular data usage, and set other cellular data options.
Notation: For help with cellular network services, voicemail, and billing, contact your wireless service provider.
If iPhone is continued 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 voice and data communications. For all other cellular connections, you can't employ cyberspace services while yous're talking on the phone unless iPhone also has a Wi-Fi connexion 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 instance.
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GSM networks: On an EDGE or GPRS connexion, incoming calls may go straight to voicemail during data transfers. For incoming calls that you reply, data transfers are paused.
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CDMA networks: On EV-Practise connections, data transfers are paused when yous reply 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 information services—including email, web browsing, and push notifications—use Wi-Fi only. If Cellular Data is on, carrier charges may use. For example, using certain features and services that transfer data, such as Siri and Messages, could outcome in charges to your data plan.
Choose cellular data options for data usage, performance, battery life, and more
To turn Cellular Data on or off, go to Settings 
> Cellular.
To set options when Cellular Data is on, go to Settings > Cellular > Cellular Information Options, then exercise any of the post-obit:
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Reduce cellular usage: Turn on Depression Data Manner, or tap Data Fashion, then choose Low Data Mode. This mode pauses automatic updates and background tasks when iPhone isn't connected to Wi-Fi.
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Plough Data Roaming on or off: Data Roaming permits cyberspace access over a cellular information network when you're in a region non covered by your carrier's network. When you're traveling, you can turn off Data Roaming to avoid roaming charges.
Depending on your iPhone model, carrier, and region, the following options may be available:
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Turn Phonation Roaming on or off: (CDMA) Turn Vocalization Roaming off to avoid charges from using other carrier's networks. When your carrier'due south network isn't bachelor, iPhone won't have cellular (data or vocalisation) service.
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Enable or disable 4G/LTE: Using 4G or LTE loads net information faster in some cases but may decrease battery performance. There may be options for turning off 4G/LTE or for selecting Vocalization & Data (VoLTE) or Information Only.
On iPhone 12 models and afterwards, you can exercise the following:
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Enable Smart Information mode to optimize bombardment life: Tap Vocalism & Information, so choose 5G Automobile. In this mode, your iPhone automatically switches to LTE when 5G speeds don't provide noticeably improve performance.
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Utilize college-quality video and FaceTime Hard disk drive on 5G networks: Tap Data Way, so choose Let More Data on 5G.
Set up a Personal Hotspot to begin sharing the cellular internet connection from iPhone
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Get to Settings
> Cellular, so turn on Cellular Information. -
Tap Set Personal Hotspot, and so follow the instructions in Share your internet connection from iPhone.
Fix cellular data employ for apps and services
Go to Settings > Cellular, then plow Cellular Data on or off for whatever app (such as Maps) or service (such as Wi-Fi Assistance) that can use cellular data.
If a setting is off, iPhone uses merely Wi-Fi for that service.
Annotation: Wi-Fi Aid is on past default. If Wi-Fi connectivity is poor, Wi-Fi Assist automatically switches to cellular information to boost the indicate. Considering yous stay continued to the cyberspace over cellular when you lot have a poor Wi-Fi connection, you might use more cellular data, which may incur boosted charges depending on your data plan. See the Apple Support article Virtually Wi-Fi Assistance.
Lock your SIM menu
If your device uses a SIM card for phone calls or cellular information, you tin can lock the card with a personal identification number (PIN) to foreclose others from using the card. Then, every time you restart your device or remove the SIM carte, your card locks automatically, and you're required to enter your Pivot. See Use a SIM PIN for your iPhone or iPad.
how to change download settings from wifi to mobile data
Source: https://support.apple.com/guide/iphone/view-or-change-cellular-data-settings-iph3dd5f213/ios
