I am in Philippines on a remote Island. I am setting up for satellite APRS.
I currently have APRSDroid android phone app to talk to my Baofeng 8w handheld VHF/ UHF radio.
I have made a 19.5 1/4 wave Ground Plane antenna as per Bob Bruninga, WB4APR APRS website. http://www.aprs.org/ This antenna dimension 19.5 inch is magically 1/4 wave VHF APRS and i think 3/4 or 4/5 wave UHF.
I am currently making the cable to go from my Android phone to my Baofeng radio.
So I will wait for either
PSAT 145.825 Mhz
PCSAT 145.825 Mhz
International Space station on UHV 437.550 Mhz
to come over and then send my APRS messages up, addressed to OUTNET or EMAIL. and they will be digi-peated to the world and relayed back to me on Outernet.
I have not transmitted to a satellite yet but I have left my RTL-Dongle connected to my 19.5 inch 1/4 wave antenna overnight on 145.825 and I have received a few APRS messages from the APRS satellites as they go over. I use GQRX for Ubuntu and its inbuilt 1200 baud AFSK decoder
So far I have only used the APRSdroid internet connection (TCP-IP) function to send test messages to Outnet. It works fantastically.
You need to add some 500 ohm resisters as well and possibly other forms of protection between the radio and phone.