Just one word to express this product, which is "EXCELLENT". I've tried this FREE application on my P1i and I got a very responsive answer and it works REALLY GREAT. I can have my contacts in groups and the connection is very good because it uses Direct connection to yahoo! messenger server instead of using other protocols. I think you don't need PC anymore to reach your friends YES Yahoo!Messenger is in your hands boys
You can connect using GPRS,3G, and WLAN
And I Tested this Application, I used GPRS then i CHECKED send & received for this app and the result was very GOOOOD VS the other mobile messenger apps So you can pay little money for chatting whit your girl friends

(sorry 4 bad english)
Some Features

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add and remove contact
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conference
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contacts grouping
- send message to group or several selected contacts
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send and receive BUZZ
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receive offline message
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incoming mail notifications
- typing notification
- offline/online notifications
- show/hide offline contacts
- set or view status
- skinnable (4 type skins)
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60 emoticons
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message alerts : vibrate, sound, flash backlight
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Chat History (message archive)
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Send to Others (send message to buddy outside contact list)
- Add 4 emoticons (total 64 emoticons) and with bigger images
- Add set custom busy status
- Add new settings (enable/disable automatic open ChatView when receive message)
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Auto reconnect when connetion closed
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direct text input (you can input text and view chat in the same window)
- show/hide timestamp
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Support QWETY keyboard
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Support TouchScreen
- numpad navigation for alternative navigation key

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And support MIDP 1.0 and CLDC 1.0 So you can use it on every
Java & UIQ mobile handset.................Enjoy that
SCREENSHOTS