Greetings and welcome.
As described by the TechCrunch article titled "PSA: Missed Call From A Mystery Number? Be Careful", it advises against answering/calling back numbers that you don't recognize.
The trick? They only let the call ring once before it automatically hangs up. One ring is enough for the number to show up on your missed call screen, but just short enough that you’re not likely to answer it in time (which keeps the call from fully connecting and thus keeps the scammer from having to front for any long distance fees.)
Well, today, I've gotten 4 calls from similar numbers
I hope this serves as some record to the numbers that they used.
You'll need to talk to Bobbi in order to start the quest "The Big Dig".
Arriving at the town of GoodNeighbor, I discovered that Bobbi's door was locked and the slide plate on the door was closed. Couldn't talk to Bobbi or pick the lock. I decided to check out the town. Upon arriving at the establishment called "The Third Rail", I encountered the town's leader, Hancock, giving a speech about the evils of the "Institute". You'll need to wait until the entire dialog concludes.
Once that conversation completes, you'll need to walk back over to Bobbi's door and when you approach the door, the slide plate will open and you'll see Bobbi's face through the opening.