Currently the PAYware mobile encryption sleeve (credit card reader) is only compatible with the iphone 3G and iphone 3GS.
PAYware mobile has an iphone 4 credit card reader in the works, and PaymentMax will be one of the first to offer it to clients.
The iphone 4 is significantly different than the iphone 3G, 3GS and any attempts to use the encryption sleeve with the iphone 4 may void warranties for either device.
If you would like to accept credit cards on your iphone 4, you may do so with a manual entry of credit card data using the PAYware mobile application.
For more information on accepting credit cards on iphone 4 , and how PaymentMax can upgrade clients with the PAYware mobile encryption sleeve with no additional service fees.