meg.kingswood Said:
"No luck unfortunately.: I tried no cover. Then, I tried no cover + mute trick. Still, Call Failed after I entered the numbers and pressed #."
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Whom to Contact:
Contact your carrier, if you are having issues with numbers not being pressed as they should be, and if you are losing calls for no apparent reason, other than tapping the pound key.
Resetting to Factory Settings:
Resetting your iPhone to Factory Settings may get the job done. All would be updated and the phone number and contacts and such would reside, being there is a SIM card inserted.