[TheBORG] writes "An Austin woman who dialed 911 recently discovered what she said could be a fatal flaw in some new cell phones. She called for help when she arrived at some vacant property she owns in east Austin and found her security chain gone. She grabbed her new Verizon Wireless Casio G'zOne phone, which to her horror made an audible alarm when she called 911. Fearing vandals were still on the property, she hung up and hid, then put her hand over the earpiece and dialed again to muffle the sounds. A Verizon Wireless spokesperson says it's mandatory according to Section 255 of the Telecommunications Act. The FCC says Section 255 of the Telecommunications Code requires that phones let a caller know a 911 call is underway, but does not require an audible alarm. This thread on Howardforums.com mentions that the alarm is present on new Sprint phones too."