Apple may be working on a new integrated micro-SIM card solution for a future iPhone model, according to a report from GigaOM. Citing sources inside European carriers, the report states that Apple has been working with SIM-card manufacturer Gemalto to create a SIM card that will be integrated directly into the iPhone and can be activated on any carrier. Customers could then simply buy the iPhone and use an App Store application to sign up for service with their carrier of choice instead of having to purchase a carrier-specific micro-SIM card separately. SIM cards have traditionally been tied to individual carriers, whereas an embedded SIM would accept activation from any carrier rather than containing hard-coded carrier information. Apple is already unique among phone manufacturers in requiring iPhone activation via iTunes and this could be leveraged to provide the same security and carrier activation features without requiring the need for a removable SIM, effectively allowing the integrated SIM chip to be programmed with carrier information during the activation process. Other advantages of removable SIM cards such as international roaming and transferring between devices could likely also be addressed through an on-device app or as part of the iTunes activation process. Neither Apple nor Gemalto have yet responded to any requests for comment.