I’ve moved your question into a topic on the same matter so we can focus the conversation in a single place.
We’ve seen different members solve this issue in different ways. Please try the following, stop when the problem is solved, and then tell us which thing solved it. (You don’t need to complete the list if the problem is solved before the list is completed.)
First, please make sure you’re on WiFi and in an area that normally has good cellular coverage.
Reset the network settings by opening the phone dialer as if you were going to make a call, launching the numeric keypad, and dialing ##27263#. Tap the send button, and agree to any dialog boxes that appear. Did you get any errors about the 27263 sequence? If so, please use these steps instead: How to Reset Cellular Settings on Samsung Galaxy Phones with CDMA SIM Card – Republic Help
If the problem persists after taking the steps above, then some people have seen it solved with a factory reset of the phone. (Read step 3, below, before you take action.) This will remove any apps you’ve added, remove any accounts you’ve added, and delete all your personal content (texts, photos, music, etc). How to Perform a Factory Reset on a Samsung Galaxy Phone via the Settings Menu – Republic Help Once you’ve done the factory reset, you’ll need to sign back into a your Google account and restore at least the Republic Wireless app in order to see if the phone is now functional.
I’ve seen two people indicate that a new CDMA SIM card solved the issue for them. They had both done a factory reset before replacing the SIM card, but there’s no way to know if that was a factor. I’d be glad to try sending you a new CDMA SIM card so you can try this, but you’ll need to decide which is more important - the possibility of a quicker fix if the factory reset does the job, you could accomplish that today, or the possibility of a fix without needing to factory reset - in which case you’d want to wait for the SIM card. Some people find a factory reset to be the very last thing they’d ever want to do, and some people want to try whatever might be the fastest fix, so this will need to be your call.
I see that you also opened a Help Ticket and are working with one of our Experts on the matter. I don’t want to create a situation where you are trying things from both directions and make things worse, so please pick one conversation and focus on getting the help you need, there.