International travelers who want an iPhone 4S for its global roaming should buy their handset from Sprint or Verizon Wireless. These two carriers will unlock your phone so you can use it with any international rate plan. (Updated below)
In order to use the iPhone 4 on T-Mobile you have to jailbreak it, unlock it and then annoyingly cut your fatty SIM into a Micro SIM. Annoying! T-Mobile is making it a little easier by giving Micro SIMs to their customers.
AT&T CEO Ralph de la Vega stated in an interview at the D9 conference last week that his company is working on even smaller SIM for smaller, thinner phones.
Most GSM phones use regular SIM cards. Which are small. The iPhone 4, iPad and uh, not many other devices use next-gen micro SIM cards. Which are smaller. Apple's just proposed a new SIM standard. Which is smallerer.
You don't have to pay AT&T twice to access the internet with your iPad 3G if you have an iPhone 4. You can use the iPhone 4 Micro SIM card as long as you introduce the use the settings above.
We've shown you how to turn a regular SIM into a Micro SIM, but what if you want to do things the other way around? Here's how to turn a Micro SIM into a regular-sized SIM card.
MAXroam's iPad-friendly microSIM will let you take your coffee-shop wankery from Starbucks to streetside cafes in Milan. Their microSIMs cost an extravagant €75/$95 for 50MB of data, but at least you'll be able to tweet smugly from your iPad, right?
The iPad 3G may require a micro SIM—a lilliputian SIM card incompatible with anything else you own—but AT&T will be selling each bundled with a full SIM card adapter—meaning you could potentially use your data plan elsewhere. UPDATE:
One of the new bits of iPad viscera announced by Steve Jobs, besides the A4 chip, is that it's using a micro-SIM card for its 3G powers. What, pray tell, is a micro-SIM card?