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View or modify cellular data settings on iPhone

You lot can plough cellular data and roaming on or off, set which apps and services apply cellular data, see cellular data usage, and set up 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 condition bar.

5G, LTE, 4G, and 3G service on GSM cellular networks support simultaneous voice and data communications. For all other cellular connections, y'all tin can't utilise cyberspace services while you're talking on the telephone unless iPhone also has a Wi-Fi connexion to the internet. Depending on your network connection, yous 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 direct to voicemail during information transfers. For incoming calls that y'all answer, data transfers are paused.
CDMA networks: On EV-Practice 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 reply, data transfers are paused.

Data transfer resumes when you end the call.

If Cellular Data is off, all data services—including e-mail, web browsing, and push button notifications—use Wi-Fi only. If Cellular Data is on, carrier charges may apply. For example, using sure features and services that transfer information, such equally Siri and Letters, could effect in charges to your data plan.

Choose cellular information options for data usage, performance, battery life, and more

To turn 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 any of the post-obit:

Reduce cellular usage: Plough on Low Information Mode, or tap Data Mode, then choose Low Information Manner. This mode pauses automatic updates and background tasks when iPhone isn't connected to Wi-Fi.
Turn Information Roaming on or off: Data Roaming permits internet access over a cellular information network when yous're in a region not covered past your carrier's network. When you're traveling, you can plow off Data Roaming to avoid roaming charges.

Depending on your iPhone model, carrier, and region, the following options may be available:

Turn Voice Roaming on or off: (CDMA) Turn Voice Roaming off to avoid charges from using other carrier'due south networks. When your carrier's network isn't available, iPhone won't have cellular (data or vocalism) service.
Enable or disable 4G/LTE: Using 4G or LTE loads cyberspace data 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 Data Only.

On iPhone 12 models and after with a 5G information programme, y'all can do the post-obit:

Enable Smart Data mode to optimize battery life: Tap Vocalization & Data, then cull 5G Machine. In this manner, your iPhone automatically switches to LTE when 5G speeds don't provide noticeably better performance.
Use higher-quality video and FaceTime Hd on 5G networks: Tap Data Style, then choose Allow More Data on 5G.

Ready a Personal Hotspot to begin sharing the cellular internet connection from iPhone

Go to Settings > Cellular, then plough on Cellular Data.
Tap Fix Personal Hotspot, then follow the instructions in Share your cyberspace connection from iPhone.

Prepare cellular data use for apps and services

Get to Settings > Cellular, then turn Cellular Data on or off for any app (such as Maps) or service (such as Wi-Fi Assist) that can use cellular data.

If a setting is off, iPhone uses only 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 data to boost the indicate. Because you lot stay connected to the internet over cellular when y'all have a poor Wi-Fi connection, y'all might use more cellular information, which may incur additional charges depending on your data program. See the Apple tree Back up article About Wi-Fi Help.

Lock your SIM carte

If your device uses a SIM card for phone calls or cellular data, you can lock the card with a personal identification number (PIN) to foreclose others from using the card. Then, every fourth dimension y'all restart your device or remove the SIM card, your card locks automatically, and you're required to enter your PIN. See Utilize a SIM PIN for your iPhone or iPad.