Hello @Glenbuck1913, thanks for reaching out today and I am sorry to hear you are having some issue signals.
So I can just confirm before you had a new sim card your 4G signal was perfect?
Are you also finding it is switching between 5G and 4G? Because your new phone is 5G it will prioritise using the 5G connection more than the 4G. As 5G isn't as common as 4G yet personally what I have done to my phone is turn the 5G mode off for the time being unless I am in a major city centre you will find this improves your 4G signal.
Please do keep me updated. Thanks
Matt - Forum Team
New around here?