Who called from 2038713600

Sometimes 4 calls a day. Never a message.

keep calling and i get busy signal when i call back

Calls twice a day. I don't recognize the phone number. No message left, only a very loud ring tone at the end.

Just called, I live in CT so I almost picked up, but the number looked odd to me with the zeroes, so I let vmail pick up.  They did not leave a message

Called my cell yesterday and today. I have an app that blocks spam calls where my phone will ring once and then nothing. No idea what the caller is from but the app says its spam/scam so I trust that.