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You can, but you need access to Installer level programming. I'm not going to give you detailed instructions here, because any fool can do the reverse and UNrestrict a phone with the same instructions, but system program 500 and 501 sets day and night restrictions on a phone. Setting the COS to 7 lets the phone dial 0, intercom, and, by programming, System speed dial numbers.
COS 8 allows Operator only (internal operator).
By building tables, you can actually program different restrictions and exceptions for COS 2-6. There's a fairly comprehensive discussion in the Panasonic Features Manual of your TD 816/1232 manual.
When the system was installed, someone programmed it to restrict first digit 0, or the telco is restricting it. That same installer has the ability to reprogram the system to allow some or all digits. At the very least, you might be able to put allowed mobiles in system speed dial and that may unrestrict the number.
You are having an issue with your service. Nothing you can do manually. Call Nextel. If your carrier, "Nextel" isn't present on the display then you have a service issue. Ready means that an emergency call will work but you can't make or receive calls.