Apart from Grab, which is the best way to find a taxi in the night, if you stay far from the night life ?

 

Is there any radio taxi correct and efficient service ?

Plenty of taxis/tuktuks driving around looking for fares.

Most fleet taxis have a phone number somewhere on the body or rear window.  Note a few of them that you see frequently in your neighborhood and put them in your phone contacts.

Try Bolt.

Grab, Bolt and InDrive apps all work, so I'd install all of the apps. Sometimes you'll find better availability on one or the other.

 

If you're far from "civilization" they are often uninterested in traveling far to pick you up.