I'm using an app on my smart phone, called MileIQ, so I know where I have been.

Compare that to the last time you looked at your smart phone. 

Btw, sorry for the errors im working off a small smart phone. 

So, while you're checking the mailbox, I'm sitting on the beach checking my accounts online via smart phone.

If you can't invest that money or time into a camera, there are some great apps available for your smartphone.

We use a newer cell carrier and pay $40 month for the both of us on smart phone plans (unlimited text/data).

Don't really need to so long as you have proper bookkeeping.Assume they don't put their name on the deposit slip:1) If the tenants paid by check, a lot of banks shows a softcopy on the online system, so you figure out who paid based on the check image.2) If both pay cash AND they are the same amount, the easiest way is to ask the tenant to send a copy of the receipt (using smartphone) to your property manager, who will then forward to you, so you will know.To be honest, once they know that you ask them every single month, they will self-adjust one way or the other.

If you wouldn't jump in an airplane and ask via your smartphone how to fly, then please don't make the mistake of thinking investing is so easy that anyone can do it without a proper education.

While there are quality smartphones, you might have to invest in a good camera.

Help them with the app and getting set up as long as they have a smart phone and for me it hasn’t been so bad)