Using LTE Apple Watch on its own for SMS/MMS, phone calls & notifications
An LTE-outfitted Apple Watch lets you do many things without a paired iPhone, but sending or receiving cellular phone calls or SMS/MMS texts comes with some caveats. SMS/MMS messaging According to Apple’s support documentdetailing using Apple Watch without an iPhone nearby: To receive SMS/MMS on your Apple Watch Series 3 (GPS + Cellular), your paired iPhone must be powered on and connected to Wi-Fi or cellular, but it doesn’t need to be nearby....