Hi Gran1948,
Thanks for your post and welcome to our community.
Very sorry that your new SIM isn't working in your phone, this isn't good.
Has the SIM card been activated?
Usually when it shows invalid this does advise that the handset is network locked, this is something we can help with though.
Do let me know if you're still having an issue using the SIM and phone and I can pop you a message to get some more details.
Emma_C - Forum Team