There's a SIM card tray on the top of the phone between the headphone jack and the lock button. It can be opened with a pin or the SIM tray opening tool that came with the iPhone.
yes a plateau sim card will work on the iphone all you have to do is go to plateau and have them unlock it.
From your blackberry ,copy all your contacts to your sim card. Then remove the sim from your bnlackberry and put it inside the iphone. On your iphone do the import sim contacts. To give you the step by step provess on how to do the sim importing go to the link http://nice-to-know-about-iphone.blogspot.com and search for the topic "how to import sim contacts" hope it will help
For the iPhone 4s you will need a micro sim. If you have a normal sim card just go to your nearest phone dealer eg.Optus, vodafone and ask for them to change it to a micro sim. It should be free. To find your nearest dealer go to their website.
Go to iphone store and check your phone out simple..
Of course, the iPhone 3G and/or the original iPhone will take any normal sim card; the 3G iPhone will take the 3G sim as well.
In some situations, the status bar on your iPhone might display No SIM, even though your iPhone has a SIM card.
No
No sim cards are only for numbers
You can fit a SIM card from your HTC Wildfire to an iPhone 4 by using the SIM port included in the iPhone.
The iphone 4 comes with a micro sim. Your normal sim will not work with it. My AT&T dealer says he can transfer data directly from your sim/old phone to your new iphone 4.
Only in sims 3 ambitions for iPhone/ipodtoch
the iphone has a sim card which slots in the top of the iphone. to get the sim card tray out you have to use a pin or the special tool it came with to open it.