Telephone bills can be paid at most chain convenience stores such as 7-11, OK and Family Mart. (Check the back of your bill to make sure which convenience stores accept payments for these bills.)They can also be paid at banks, post offices or the gas company. You can also arrange to have automatic payments deducted directly from your bank account. Payments are due within seven days of billing, late payments can only be made at any Chunghwa Telecom branches if you are one of their customers.  Taiwan Mobile is similar.  Fareastone has no English services.

Some helpful numbers Chunghua Telecom:
Customer Service: 0800-080-080 (toll free)
Telephone Repair Service: 112
Overseas Operator: 100
Directory Information in English: 106
Billing Inquiries: 123

Taiwan Mobile:
TWM users can dial the toll-free short code 85238 to receive a text message containing our nearest service location
24-hour English toll-free customer hotline:
In Taiwan: Dial 188 or 02-6606-2977
Overseas: +886-2-6606-2999 then press 7

Chunghua Telecom English Site

Taiwan Mobile English Website