I have never heard of an iBook.
Could you be more specific perhaps?
At the back of your device is a model and type number.
Please join our forum to reply with that information in this thread so we can help you with your question.
Forgive the confusion but first let's figure out what device you have. The iBook is one of Apple's older laptops, and assuming that since you posted the iOS software version you must mean an iPad.
Secondly, the Square Readers only require the reader itself which attaches to the 3.5 headphone jack, and accompanying software. I don't recall a SIM card being needed, unless, your iPad is cellular as well as wifi.
I hope this helps and like advised before, please feel free to join the forum and ask for further assistance.