TelOne has been slowly switching their area codes over the last couple of months and the updated number. TelOne sent out a document with the complete changes and they will be as follows:
To access all the services available with TelOne’s converged network, your landline number has been modified to start with a prefix. The last digits of your current number remain the same. Area Codes have also been changed as indicated below:
Convenient.Supply an online directory as well.