Android Question LTE /4G signal


Dear :
I show previous thread about get the signal of LTE in android app ,when i try to test it as it in this post
it print in log "99" once , and didnt print it frequently when signal change.
my questions :
1-why it show me "99" message
2-in this code i get the signal when it changed , how i can get the signal when i send a command "like code in Timer"

please note my android version is 12
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