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Samsung SLS-BU103 4G LTE Extender Problem with iPhone 11

I've had a BU103 extender for about a year - solved initial connectivity issue (people on other end of calls not hearing me) by shutting of VoLTE option under cellular data.  Recently, this problem is back and toggling the VoLTE option does not solve it.  WIFI calling is off, I've toggled airplane mode, and done factory reset of extender.  Still same problem - once call connects, people on other end can't hear my voice, or phone isn't even recognizing the extender signal.  What has verizon changed in their system that this problem is back?

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Re: Samsung SLS-BU103 4G LTE Extender Problem with iPhone 11
Customer Support

Thank you so much for your response, Apgar. Please meet us in a Private Note for troubleshooting. *Cecile