There has been a number of reports that the iPhone 4 micro sim does not work in the iPad. I have just got my O2 uk iPhone 4 micro sim to work in my iPad and this is how. On your iPhone 4 go to settings>general>network>cellular data network and make a note of the cellular data APN, username and password.
Then remove your micro sim and put in the iPad. It will appear not to work. However go to settings>cellular data>APN settings and insert the settings you noted down from the iPhone 4. It will work and you can use you iPhone 4 data account.
Hope that helps some other people
Then remove your micro sim and put in the iPad. It will appear not to work. However go to settings>cellular data>APN settings and insert the settings you noted down from the iPhone 4. It will work and you can use you iPhone 4 data account.
Hope that helps some other people