Blackberry 7230 can receive short messages, but it can't send them out. Please help me.

Set GPRS and MMS shortcuts for mobile phones.

First, insert your China mobile card into the mobile phone you want to set up, turn it on, log in to the website /msp/tpm/html/index.jsp, enter your China Mobile phone number, select the mobile service type, and click "Login". Its service platform will send you a password. At the prompt, enter the password you received, and then click Login. Select the brand and model of the mobile phone. Click Set My Phone. Enter the next prompt dialog box, follow the prompt "Prompt on mobile phone:" Service settings received "or" new message ",press and hold the left selection key to select" Options "and select" Save ". If "Activate service settings? Information is displayed on the screen, press and hold the left selection key to select "OK"; If "Memory Full" is displayed, do you want to replace it? Or "Update Settings? "Press the left selection key to confirm. The mobile phone prompts "service settings have been activated".