Hong , I really need to call back to the UK but I can ’ t afford to pay for the roaming charges .   Well , why don ’ t you use a local SIM card ?   Can I do that ?   Yes . Just go to the convenience store and ask for a SIM card . Then insert it into your phone .   I see . How much will that cost ?   Well it ’ s 100 RIB for the SIM card then it will cost you about 10 RIB per minute to call the UK . 