Playing with the app in Singapore: I bought a Singtel tourist SIM card while traveling in Singapore for a few days and tested the app to see what they were using for their 3G and 4G networks.
Singtel is one of the few operators in the world which is going to completely shut down its 2G network in 2017. They have already stopped selling 2G subscriptions and favor 3G/4G on their network. They are using U900 for 3G and using both L1800 and L2600 for 4G.
The application development is progressing well, hoping to publish the app on Google Play early February.