lost my mobile phone (Samsung Onmia 2)

I lost my mobile phone (Samsung Onmia 2) last friday in company (I bought it at cost of S$398 with 2 years' MIO plan on Jul 09), I believe i left it somewhere unattended and one of contractor took it. I called up Singtel hotline and terminated the service and they agreed me to bring forward the contract from next yeat and re-sign it at current promotional price. So I bought a new phone (Sony Ericsson C903) with renewal of 2 years' i-Oneplus plan at cost of S$188 this tuesday.