Texts wont send when on LTE only


    I have a ZTE Axon 7 Mini and live in an apartment where reception inside is pretty spotty.  I have usable LTE coverage but often times i will lose GSM connection and be left with LTE only.  When this happens I am unable to send/receive texts.  This could probably also go into the network section, depending on what the cause of this is.  Are phones unable to send texts via LTE only?  If the answer is no, is it my phone that is messing up and not sending? 

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