Hello @Elizabeth 4 and may I extend a Warm Welcome to the Samsung Community Forum 👋
In your phone's Settings under connections > Mobile Network > Check what the Network Mode is set to.
Also as a process of elimination can you try your sim card in another phone 🤔
If i can be of any further help please don't hesitate to ask 😎
Daily Driver > Samsung Galaxy s²⁵ Ultra 512Gb ~ Titanium Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "
