AT could stand for many things depending on the context. Here are a few common meanings:
1. "ATM:" Automated Teller Machine (for withdrawing cash)
2. "AT:" Apple TV (a streaming device)
3. "AT:" Athlete's foot (a fungal infection)
4. "AT:" Atomic Time / Atomic Timekeeping
5. "AT:" Attention (used in military or technical contexts)
6. "AT:" All Terrain (referring to vehicles, etc.)
7. "AT:" Attitude
8. "AT:" Adenine (a nucleotide base in DNA/RNA)
9. "AT:" Aspartic Acid (an amino acid)
10. "AT:" Address (in some contexts)
11. "AT:" Action Team
12. "AT:" Academic Title (like Assistant Professor)
13. "AT:" Access Technology (for people with disabilities)
14. "AT&T:" The major American telecommunications company
15. "AT:" In computing, often refers to "At" symbol (@)
Could you provide more context so I can give you a more specific answer?
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手机之家2014年10月26日消息——iPad发布会当天没有太多提及的Apple SIM在会后被发现是相当厉害的一招棋,大有跨过运营商直接与用户对接的霸气。不过事实证明运营商也不傻,还是会坚决维护自身的利益:美国AT&T会直接锁定Apple SIM。

一旦iPad使用了AT&T提供的数据服务后,iPad就会弹出消息提示用户一旦激活后想要更换运营商就需要更换SIM卡,和使用普通的SIM没什么区别,虽然和国内的我们没有太大关系,但还是觉得有些不给力。
苹果果然还是走在了时代的前列,不怪苹果太超前,只叹商家不给力啊!