I have had Verizon ever since we built our house 10 years ago. 2 weeks ago the cell reception became sluggish on all of my family's phones (Iphone 13's - all software updated). Now it is just one bar (at best) and sometimes it says "SOS". Have to go outside to make a call and then it gets 5 bars.
My wife got a new SIM card and that did not help. Calls drop (or we do not get them at all) but we get texts. Hate to switch carriers after 25+ years but we have to have service in our house. We have NEVER had an issue before. We have not done any renovating or purchased other electronics that would interfere.