Cannot send/receive roaming calls or texts

I am travelling with my Teracube for the 1st time. My data roaming is working great, but I cannot send or receive calls or texts. I have switched my sim card into other phones and have no issues. If I simply dial 1 it says USSD code running, then a error pops up with my carrier name stating unvalid MMI code. I have tried rebooting, airplane mode, changing all settings, all networks, etc, etc.

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I was initially receiving some texts as I travelled through some states (from Ontario), others were getting lost, and I would only receive a fraction also. Now in Florida cannot send or receive any texts. They appear to go through but noone receives them.

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That is frustrating, sorry.

What model and version are you on?