Numbers and letters only; special characters and spaces will kick the user back to the nickname entry popup without an error message.
The feedback noise happens when the OG callsign both receives and opens the message (since the transceivers beep whenever a message is received by default). They can still hear spoken messages when they receive them/try to play them back, it's just that they hear a loud, crackly noise right at the starts of them, with some staticky background noise as the message itself plays. They can still read text messages without noise, although they will get the same feedback when text messages are received.
Someone with a copied callsign can send messages with no issues. They can also see if someone else is sending messages under their callsign; messages sent from another transceiver, even one copying their callsign, will still register as a new incoming message in a conversation (so it will feedback-beep every time), and will show up in conversation logs as if they had sent it.
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The feedback noise happens when the OG callsign both receives and opens the message (since the transceivers beep whenever a message is received by default). They can still hear spoken messages when they receive them/try to play them back, it's just that they hear a loud, crackly noise right at the starts of them, with some staticky background noise as the message itself plays. They can still read text messages without noise, although they will get the same feedback when text messages are received.
Someone with a copied callsign can send messages with no issues. They can also see if someone else is sending messages under their callsign; messages sent from another transceiver, even one copying their callsign, will still register as a new incoming message in a conversation (so it will feedback-beep every time), and will show up in conversation logs as if they had sent it.