Apple iPhone 6s may have faster LTE and longer battery life
If recent photos prove to be true, then the inevitable iPhone 6s will have an upgraded Qualcomm MDM9635M LTE modem over the one in the original iPhone 6. The new model will feature LTE-Advanced (LTE-A) Cat. 6 for theoretical download speeds of up to 300 Mbit/s. Qualcomm first announced this 4th generation multi-mode chip at the end of 2013.
The MDM9635M almost doubles the theoretical LTE speed of the MDM9625M in the iPhone 6 and iPhone 6 Plus while consuming less battery power. However, upload speed remains identical between the two Qualcomm chips at 50 Mbit/s.
Other details from the image show a smaller motherboard for the iPhone 6s. The additional free space may be used for a larger battery. Note that the iPhone 5 and iPhone 5s also used an older generation Qualcomm MDM9615M modem.