I purchased a newly renovated single family home and started screening tenants immediately.   2 friends came together and filled out an application together. they were looking to move in together and said they were old family friends. first applicant (lets call her lisa) is a mother of 3 (all under age 10) and the other (lets call her linda) is a single female. together they had a strong application. they were selected, signed a 3 year contract and agreed on a move in date (they needed to give their currently landlord 20 days notice to move out). 

Having strong tenant screening practices in place helps - my manager charges $40 per credit check and doesn't make much off it, but checks court records, criminal records, credit, and so on.

She does not reply to messages and her phone is off.

Brandon & Heather Turner's The Book on Managing Rental Properties: A Proven System for Finding, Screening, and Managing Tenants With Fewer Headaches and Maximum Profit would be a great start.

Person on lease is not accessible, as his/her phone is not in service anymore.

This type of behavior triggers numerous phone calls to their Quota and after a while, they will begin to see the threats. 

Pics of the vehicle, pics of him, and if he lays down any sort of personal threat like, "I'm gonna (whatever)" you're on the phone to the police immediately.The only thing I would add is that you should probably send your husband in alone for this one, or have him go with a male friend. 

Sept 2nd and 3rd were quiet, and yesterday, my phone exploded.

At this point they are over 30 days late and are ghosting me when I try to reach out via text or phone call.My paperwork shows I can forclose after 30 days.

Do a thorough screening on the applicant.