Source:[1] The emergency numbers in Taiwan are 110 (police) and 119 (fire and ambulance services).

All numbers starting with 3 belong to Chunghwa Telecom, as CHT holds a monopoly in Taoyuan District.

Numbers that start with 4 are assigned to Chunghwa Telecom except ranges 405 (APT), 406 (TFN), and 449 (NCIC).

The 01 code was reserved for Nanjing, which was the capital of the Republic of China before its retreat to Taiwan.

When calling a Taiwan landline phone number using a local Taiwan mobile phone, the 0 prefix for the area code must be included (e.g. area code with 0 prefix included + 8 digit landline number).

Format: (09X)XXXXXXX Mobile Phones with 090 range is mostly used for wireless data services (M2M).

[7] Consequently, in the early 1970s, Taiwan had to be unofficially assigned a separate code, 886, although there was pressure from China to change this to 866.