Inbound texts automatically add country code, won't allow me to respond


I travel a great deal for work and spend most of my time overseas. Because of this, I have a local SIM I use in Europe (Vodafone). I have everything set up, texting, calling, data. However, everytime I receive an inbound text, the country code is automatically added, +39 in this instance. Everytime I try to respond to a text, it get the "Message Failed" notification. I AM, however, able to send texts while texting the respondents number manually, or using my contacts list, without country codes added. I've tried with Assisted Dialing off and on, with the current country configured properly. Any help with this is greatly appreciated, I've scoured Google for answers but nothing seems to work.

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