BiggerPockets forums and profiles are currently mobile optimized for iOS and Android via a mobile browser and we're adding additional features little by little.  

A lien is an I-O-U for the taxes on the real estate.

The newest version of the BiggerPockets App is now ready for your iOS device (Apple only folks - No android yet)And this version includes the ability to "Search" for topics!

@Lucas Hall Does anyone know if Cozy is planning on making an App for IOS? 

got wrung up once from the state of Oregon and pad a slap your hand fine.. but they harped on the common enterprise and that we were the sole provider of the outcome and as such we needed to register our model as a security in Oregon.. of course we had no clue.. paid a small fine and went on our way.. but your right the regulators can take harsh views of common enterprise guaranteed returns etc.

Freddie just announced this morning that the cost of I/O was cut in half!

Most loans are amortizing, a couple are I/O. 

There's even iOS/Android apps now.

It's also a viable way around the "no down payment gift funds for investment property things" by doing it as NOT a gift, but a very generous 2nd mortgage... like 3% rate, i/o, balloon due in 30 years.

I owe $108K on it and I pay 10% I/O to my private lender.