Chennai: Hutch subscribers can now pay their mobile phone bills at designated post offices in Tamil Nadu.The Hutch – Postal Department tie-up covers 131 post offices in Tamil Nadu, including 36 in Chennai.To locate a post office closest to them, customers can SMS – PO (area pincode) to 111.Customers will then receive a list of nearest post offices.The post office payment option is in addition to facilities such as tele-shops, self-service kiosks, online payment and drop boxes, said Kumar Ramanathan, Operations Director, Hutch (Tamil Nadu).The post office facility is targeted at customers who prefer cash payments.