Treo 650 reset itself and the phone app seems to

You can use the Unlock code to Unlock Your Palm-One Tero 650 model Phone,You can get the Unlock code from here
Wickedunlock and follow the instructions and Unlock it step by step..
Palm One Treo 650 Unlocking InstructionsWarning : Do not enter any wrong unlock codes on your Palm One Treo 650 mobile phones. If you enter over a certain amount of wrong unlock codes on your Palm One Treo 650 mobile phone, your phone may get hard locked and sometimes become unusable.
1 - Switch ON your Palm One Treo 650 with an ACCEPTED SIM Card,
2 - Go to Menu and select "Phone Tool" or "Phone Application",
3 - Type on Virtual Keyboard *#*#CODE#,
4 - Select with PEN "Numer" and Palm One Treo 650 will show that it's unlocked now!

or

1 - Switch ON your Palm One Treo 650 with a NOT ACCEPTED SIM Card,
2 - Enter the Unlock Code we send to you.

or

1. Remove Palm One Treo 650 battery, unplug cable,
2. Switch ON your Palm One Treo 650 with a NOT ACCEPTED SIM Card,
3. 'Sim not allowed' is displayed, click OK,
4. Go to the dial pad, and dial *#*#CODE#,

CODE: The unique unlock code for your Palm One Treo 650.
ACCEPTED : We mean, to use a sim card from the network your Palm One Treo 650 is locked to.
NOT ACCEPTED : We mean, to use a sim card from a network other than the network your Palm One Treo 650 is locked to.

its prob'ly caused by an app which is not fully compatible with palm os.... remove your mem.card, and sim then, hard reset... thats what i did, my treo 650 kept on restarting after i installed gizmo.... try it and get back to me....

There is an undocumented solution to link difficult devices. Instead of pushing ad releasing, hold either button down until you get a FAST BLINK and then try linking again.

Go to applications,choose Phone and the main screen of the phone will appear,then try to dial a number

I experienced the same problem while traveling this weekend. The green phone button and anything associated to the phone all of a sudden stopped working. No call out and none in. I hotsync'd and also did a "hard reset" except I said yes and then went in and hotsync'd again. Phone now works again and all data is back

You can do a soft reset by pressing the small indented button on the back with your stylus,: or you can do a hard reset by removing the battery and pressing the same button on the rear with your stylus. I would try the soft reset first, as the hard reset wipes all your data.

May I know since when the problem occur and what's happen if you tap phone application?

Could be a dodgy power connection this seems to be happening a lot at the momentif you look at other threads here.

Kevan

http://discussion.brighthand.com/palmhandhelds/showthread.php?s=3e3a9f0f6818b3260add857c81b65a99&threadid=75197