Hello 👋 @Sharon39 and may I extend a Warm Welcome to the Samsung Community Forum Section.
Is this issue happening everywhere or in a particular area 🤔
Might be a mast issue or mast congestion.
Try a forced reboot by holding down the volume down key and power button simultaneously for more than 7 seconds to restart it. When your phone resets, you will feel it vibrate.
As a process of elimination can you try your sim card in another phone, and use a different sim card in your phone and then see what happens.
On the phone there is a diagnostic test tool 🔧 found in your Samsung Members App to see if that highlights anything.
And you can reset the mobile network settings.
Settings > General Management > Reset > Reset Mobile Network Settings > Turn the phone Off and On.
A Samsung Service Centre can assess your phone if necessary.
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. "
