What are the potential drawbacks of the iPhone SE 4's 5G modem

Potential drawbacks:
* No mmWave Support Apple's modem will not support mmWave 5G, which is the fastest 5G technology but has a short range and is limited to major cities and venues[1][2][4]. The iPhone SE 4 will likely offer slower upload and download speeds compared to the iPhone 16 series, which features the Snapdragon X75 modem[1]. It will instead focus on Sub-6 5G, which is more prevalent and has a longer range[2][4].
* Slower speeds In testing, Apple's modem reached download speeds of approximately 4 gigabits per second, which is slower than Qualcomm's existing models[4]. Apple's modem chip will support theoretical download speeds of up to 4Gb/s, which is slower than the Qualcomm modems in the current iPhone 16 models[2][7].
* Fewer carrier aggregation features Apple's modem could offer fewer carrier aggregation features than Qualcomm's chip[1]. It will provide four-carrier aggregation, unlike Qualcomm's six-carrier aggregation[4]. This technology merges frequencies from multiple wireless providers to enhance network capacity and speed[4].
* Inferior performance Apple's own modem will perform worse than the Qualcomm chips it has been using for years[3]. Prototype chips tested in late 2022 were allegedly "three years behind Qualcomm's best modem chip"[2].
* Testing issues Building a 5G wireless modem that works well on the myriad of 2G, 3G, and 4G wireless frequencies in use around the world has been trickier than expected[5]. The effort has been plagued by unrealistic goals and deadlines[5]. Initial prototypes of Apple's modem faced hurdles in carrier testing and certification in dozens of markets[9].