Taiwan mobile phone regulation for foreigner

If you're a foreigner in Taiwan and you have mobile phone number here. When you go home for more than 90 days, the police will order your card provider to have your no blocked. The police department that handle this kind of problem called "Dian Xin Jing Cha Ju" (電信警察局). Here's their website: http://www.npatpc.gov.tw/contact.htm