Phone hangs a lot. Battery status drains automatically. It may be cheap android phone but if u spent some extra you may get way better phones.
Only speaker is very loud and the quality is moderate.
Apps automatically hang and while playing high ram games, the phone switches off. Ram is very less i.e 256 mb out of which half is aldready taken by apps which cannot be uninstalled. Its better to buy another phone instead of karbonn A1+ .