My blackberry wont ring anyone but it had full signal

my blackberry wont ring anyone but it had full signal its 8900

Not knowing what steps were included in "all the troubleshooting possible with Apple people," I'll suggest you give the phone a chance to reprovision your cellular account.
First turn off Wi-Fi. Then power off your phone. Hold the Sleep/Wake button until you see the power off slider. Then slide to power off. Turn the phone back on. After the phone starts watch to see if No Serive is displayed. Hopefully after 15-30 seconds that will change to the name of your cellular service provider and finally indicate LTE or 4G as well as include some dots indicating signal strength. You can then turn Wi-Fi back on.

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