Sony Xperia XZ1 Compact APN for Consumer Cellular/T-Mobile?

My wife got her Xperia XZ1 Compact on 12/25/2017. We were with Consumer Cellular on the AT&T side. After much banging around with different APN settings, we finally found one that allowed her to send/receive individual texts, group texts, and photo texts over the phone network WITHOUT turning on her data. She was thrilled. We are now getting ready for a trip to Germany, and in preparation, CC has switched us to the T-Mobile side (AT&T has no international roaming?). When they switched her Xperia, she lost all those sexy texting abilities (new APN!). We can live without all that for the trip duration, but we have lost those special APN settings for CC/AT&T when we return to the U.S. Does anyone have any idea what she's going to need for APN settings when we get home?

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