iMessage to 615 numbers

I use iMessage around the world, From Germany, to Australia, New Zeland to Canada and everywhere in-between! This is a strange issue with just one set of numbers I have.

I currently have service in Austria from (3/drei) This is where it gets weird, If I send a new iMessage to friends back in the states with a 615 area code and they respond, their number shows in the following format 6155 777701, not their name. (not a real number, used for formatting example)

This didn't start until I put the 3 SIM in my phone. In research, 3 has numbers that begin with 6 or 06 and are formatted as 0660 5552222 (5-7 digits) Just so you know, I never did figure out the 0 that begins most European phone numbers and is usually in parenthesis, I don't know what it means...

Also, tried messaging from another country (Italy freeroam) and using my email address for iMessage, neither one has resolved this.

To note, I can't update my phone yet because I don't have internet service faster than 1.5mbps. Any suggestions in the mean time will be helpful and I'll update my phone to see if this is resolved as well.