Virtually all hobby phones are non-listed numbers (at least I hope yours are) so the fact of the matter is if you don't already have a number saved in your contact list, when a new number pops up
-- do not answer it.
-- if it is someone you want to know, they will 99 pct of the time either leave a voice mail or send a text
-- absent either of the above, you can google the unknown number and maybe get a clue. 800notes.com is a good place to archive scammers and spammers.
Assuming your hardware is secured (meaning locked when not in your pocket and/or secured and hidden away all other times) you have two options:
-- you may leave the phone locked but turned on, so messages and calls can be observed when you get back to it
-- you may turn the hardware OFF, but it will still accept texts and voice mails when you turn it back on.
There are way too many scammers just randomly dialing
entire banks of phone numbers and when they get a live voice they are annotating that number as "live" so it can sold or shared with other dialing scammers and spammers.
If you have a phone or phone carrier that allows you to block numbers, do so and stymie the callers up front.
Happy Hobbying!
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