If the number to your service center is not saved on your SIM card, you must specify the number yourself. Otherwise you cannot reply to received messages or send your own. To check the service center number: Scroll to [MESSAGES], ”Yes”, [TEXT], ”Yes”, [OPTIONS], ”Yes”, [SERVICE CENTRES], ”Yes” If no number is found, select [ADD NEW?] and press ”Yes” Enter the number, including the international + sign and country code and press ”Yes”。

我有索尼爱立信 T31的问题要问