Possible Duplicate:
Doing a phone call in LWUIT
I have created text field with phone number.How do i make a call when call button is clicked?
You can use following one for make a call from your application,
String phoneNo = textfield.getText();
Display.getInstance().execute("tel:" + phoneNo );
(Or)
If your TextField in MIDlet class, you can use like this.
String phoneNo = textfield.getText();
platformRequest("tel:" + phoneNo );
Both are works fine.