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***Announcement: Early next week, we’ll be merging the current Fios and Wireless Communities into the all new Verizon Community! Beginning the evening of Sunday 12/4, both Communities will be placed in read-only mode. You’ll still be able to visit the Communities and browse content, but login will be disabled. On the afternoon of Monday 12/5, all users will be able to log into the new Verizon Community. We expect the new Community to be fully functional the morning of Friday 12/9. Additional details can be found in the Announcements board and under Featured Topics!
using a foreign SIM on a Verizon Samsung Note 4

I just bought a foreign GSM SIM for my Samsung Note 4.  I installed the SIM by removing the SIM that Verizon had installed, presumably for international service where the rest of the world is GSM.  Now, however, it seems that regardless of the settings (Global, GSM, CDMA) I can no longer get my Verizon service while at home in the US.  My previous Verizon phone, an HTC Trophy, allowed me to install a GSM SIM card and switch in the settings between GSM and the Verizon CDMA network while I was in the US.  Question - Am I doing something wrong?  Or must I physically remove and replace the SIM card when going to and from the US?  I thought that CDMA did not use SIM cards.  Thank you.

P.S.  I purchased this phone at full retail price rather than at the substantial discount under the upgrade plan just so I would have an unlocked phone.