Because are old and early released. at time of release of such old phone SA specs were not closed so were not implemented.
All smartphones with x50 do not support SA.
And there are lots of them.
x50 modem does not have NR RRC protocol layer neither SDAP protocol layer.
Now no limitation, but back then at that time there was a limittation.
So this is why we have ues that do not support SA.
All UEs with X50 modem.
Thanks @sadanandk2, clear all doubt whether device in hand support SA or NSA or VoNR or not all info you can find, very important IE.
Now, I’m having One plus nord showing it can support 5G.
But I think it’s NSA only.
From phone settings we can’t check whether it is SA or NSA.
Need L3 logs to check in detail.
Processor is Snapdragon 765g
But it is not showing SA orNSA
X52 may be mid spec b/n x50 and x55 modem
X55 chipsets support SA for sure and X50 dont support SA for sure
X52 supports SA and NSA
Courtesy: xda forum
And it depends on operator FW version OTT to visualise actual SA in your logs once deployed in network usually.
We have seen TMO holding back SA in S10+ devices with x55 modem with 600Mhz NSA only initially and later after OTA update the device started SA latching.