iPhone 7
Can an iPhone 7 be used on a wifi network but without being on a phone network? If yes, how do set it up. I've erased all data from the phone.
iPhone XR, iOS 16
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Yes, if you don't want to use Cellular Data, you can simply disable Cellular Data and use Wi-Fi only.
You can deactivate Cellular Data here:
Settings -> Cellular -> Cellular Data. Deactivate.
If you do not need to use your iPhone 7 to make calls or send messages, you can also easily remove the SIM card and only use Wi-Fi. However, you cannot use your iPhone as an Internet Hotspot without a SIM card and Cellular Data activated.