what does the letter 's' stand for in relation to mobile phone sim card

what does the letter 's' stand for in relation to mobile phone sim card. There are some references to what does the letter 's' stand for in relation to mobile phone sim card in this article. If you are looking for what does the letter 's' stand for in relation to mobile phone sim card you've came to the right place. We have posts about what does the letter 's' stand for in relation to mobile phone sim card. You can check it out below.