No. Both the 876 and 658 area codes will now be unique to Jamaica

On May 31, 2018, Jamaica officially converted to 10-digit dialing for all local calls. This is a result of the introduction of another area code (658). Phone users must now dial all 10 digits in order to reach a local number.
No. Both the 876 and 658 area codes will now be unique to Jamaica
The new dialling format will not change the way you are billed for calls. All calls beginning with the 658 or 876 area code will be billed at your existing rate for local calls.
The changes are necessary in order to differentiate between the last 7 digits of 876-prefixed numbers and 658-prefixed numbers.
No. Billing will only commence when your call is connected to the recipient.