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What error message, exactly and in full, appears when you are informed of an overload or a limit? the exact words may help me advise you as to how to proceed.
Is the Panasonic device New, or Used / owned-for-a-while ?
Try putting in fewer digits in the phone number. For instance, if you put in
XXX XXX XXXX
try putting in
(no spaces, no separators, no dash character, etc. Just the number.)