Nano-SIM card trays that are made for the next-generation iPhone are already arriving in factories and have been leaked to the public.
By analyzing these trays, it can be accessed that the new module is smaller than its predecessor, making it occupy less space inside the smartphone.
This should allow engineers to have additional room to fit more components, such as more integrated circuits or antennas inside the device. The appearance of the trays also confirms the long-rumored feature.
The first reports of Apple shrinking the iPhone's SIM card down started back in March.
An article in the Financial Times stated that Apple wanted to gain an advantage over other smartphone makers by being the first company to have these nano-SIM cards.
MacRumors also reported that Apple had submitted a proposal for a standardized SIM card design that was significantly smaller than the micro-SIM used in the iPhone 4S and iPad in 2011.
Motorola, Research in Motion and Nokia are also trying to implement these "nano-SIM" cards into their devices.
Apple's nano-SIM card will be supported by "most of the European operators," according to MacRumors.
Apple currently uses a "drawer" in its devices such as the iPhone 4S and iPad to protect the SIM. Nokia objects to the idea of the drawer to protect these new nano-SIM cards.
Apple is expected to launch a new iPhone next month.
The handset is will have a 4-inch display and a thinner frame than the iPhone 4/4S, a device that has a much thicker design that most of the current Android-powered devices such as the HTC One X and Samsung Galaxy S3.