I tried to reach through text and left a message on his cell phone with no response. 

And people wanted to believe it.BUT, if they quit paying their mortgage and they also aren't paying their cable bill or their cell phone bill, I'd never rent to them.I'd also want stable job history.  

I thought about getting headphones but if they cancel out sound, they may prevent me from hearing a sound that I need to hear in the middle of the night or in an emergency like my bell, a smoke alarm or my cell phone etc.

You can also Google that supervisor number they gave you, to see if it's just some guy's cell phone.

They will talk loudly on their cell phones outside at 2am.  

absent some other explanation.always do put BY APPOINTMENT ONLY in my online ads but now more than ever, folks will show up at the door, knocking and everything, some even help themselves to- after knocking -walk into the driveway and around the whole premises 'inspecting' the whole building even if its just one unit within.totally understand scoping out a neighborhood, street, building, and yard before making an appointment but find ppl who just totally ignore whats written in the listing and instead will show up and rather know than call from their cell, inexcusable. maybe a decade or two ago when ppl hardly ever had car phones let alone cell phones it would be understandable but just dont get how applicants expect to be taken seriously while totally being blind to such simple 3 words.then on the flipside, there is the parallel to the story - where the person who calls an employer and/or walks in without appointment despite the ad clearly stating resumes only no calls no walk in applications available, etc - gets the job.

Ask your cell phone provider....

We only manage 2 ourselves, and when we're out of the country or on vacation where cell phones don't work well, we ask a family member to take the calls and give the tenants their number.  

Internet or Cellphone accounts? 

I also suspect the vast majority of this company’s income is in selling folks like you the system and Very little from actually collecting the surpluses for people.One thing you guys need to realize, at least in my area, there are only one or two firms making any money at this, and it’s only part of what they do.AND....those few people that are Acrually making any money at this are contacting the people owed a surplus THE DAY OF THE SALE, by email and cell phone.