A method for recharging a first SIM card through a mobile phone using a second SIM card is described. The method includes: receiving identifying information; generating a first short message containing the identifying information; receiving recharging information containing a phone number associated with the second SIM card and charge amount; generating a second short message containing the recharging information; and sending the first short message and the second short message to a mobile service provider, such that the mobile service device can accordingly recharge the first SIM card.