We have the Nokia 6131 that has Bluetooth and a better TFT screen (16M
colors VS 256k on the 6136) and than we have the latter (6136) with Wi-Fi of
all things. Another notable difference is that it the 6131 model has a
smaller internal memory (32MB) than the 6136 model (11MB).In rest, they’re the same. Both have FM radio, 1.3MP camera, PTT, microSD card support and such.
Source: Info Mobile
Nokia 6136:
Nokia 6131:
Like I said same body, different guts. Why is Nokia making
something like this is beyond me. Almost everyone I know has a bluetooth
capable phone … yet none of my friends use a bluetooth device. In the rare occasion
I sync my phone, bluetooth gets turned on. Surprised they threw wifi on the
6136, what can you possibly accomplish with wifi on such a small phone and keypad?