I had a look in the Dump files using adb and it confirms my suspicions.
Service states:
1={mVoiceRegState=0(IN_SERVICE), mDataRegState=1(OUT_OF_SERVICE), mChannelNumber=3044, duplexMode()=0, mCellBandwidths=, mOperatorAlphaLong=null, mOperatorAlphaShort=null, isManualNetworkSelection=false(automatic), getRilVoiceRadioTechnology=3(UMTS), getRilDataRadioTechnology=0(Unknown), mCssIndicator=unsupported, mNetworkId=-1, mSystemId=-1, mCdmaRoamingIndicator=-1, mCdmaDefaultRoamingIndicator=-1, mIsEmergencyOnly=false, isUsingCarrierAggregation=false, mArfcnRsrpBoost=0, mNetworkRegistrationInfos=[NetworkRegistrationInfo{ domain=PS transportType=WLAN registrationState=UNKNOWN networkRegistrationState=UNKNOWN
Data is “out of service” and data technology “unknown” only voice is “in service” limited to UMTS, when it should be LTE.
Comparing with a running G5 under Google android 8.1
Service states:
1={mVoiceRegState=0(IN_SERVICE), mDataRegState=0(IN_SERVICE), mVideoRegState=1(OUT_OF_SERVICE), mVoiceRoamingType=home, mDataRoamingType=home, mVoiceOperatorAlphaLong=Free, mVoiceOperatorAlphaShort=Free, mDataOperatorAlphaLong=Free, mDataOperatorAlphaShort=Free, isManualNetworkSelection=false(automatic), mRilVoiceRadioTechnology=14(LTE), mRilDataRadioTechnology=14(LTE), mCssIndicator=unsupported, mNetworkId=-1,