A free program for Android, by NIC.br.

The SIMET application is designed to test the quality of Internet for mobile devices. The results are used by the Internet Steering Committee (ISC) to generate a map of the Internet in Brazil, which indicates how good the quality is in each region.

You can use this app to know the following information:

Internet speed (upload and download)
Network latency (ping)
Packet loss
Quality of other operators anywhere in Brazil
Places where there was an error in your test
Advanced information about your cell phone signal