Bought a new Acer Z320. Installed Sim. messages and calls come up, on the header. But, asks for a pin number. I have no pin, and cannot find it on the packaging. Can know?, where it is. On the package there numbers to include EAN/UPC/IMEI, bar codes w/ numbers. But I am informed if I try more than twice, it will block the phone, via the SIM card. Why is there no explanation in the manual. This sucks. Please help. Thanks. Terry