Without an active cellular service (such as a SIM or eSIM with a valid voice plan) on your iPhone, you won’t be able to make traditional cellular voice calls or send regular SMS text messages. These services rely on your mobile carrier’s network, and without access to that network, they simply won’t function.
However, if your iPhone is connected to the internet via Wi-Fi, you can still communicate using internet-based services. One of the most seamless options for Apple users is FaceTime, which allows you to make audio or video calls to other Apple devices (iPhones, iPads, and Macs) using either their phone number (if it’s linked to FaceTime) or Apple ID.
In addition to FaceTime, you can also use third-party apps like WhatsApp, Skype, Telegram, Zoom, or Google Meet to make calls and send messages—provided both you and the recipient have internet access and the respective app installed.
So in short:
- No cellular service = no regular calls or SMS.
- Wi-Fi = you can still make calls and messages using internet-based apps like FaceTime.
Basically, your iPhone turns into a Wi-Fi-powered communication device with a few more tricks up its sleeve than a walkie-talkie.