The new iPad bids farewell to physical SIM cards: supports China Unicom eSIM

News on May 8th, yesterday Apple released the iPad Pro equipped with M4 and the iPad Air equipped with M2. The official website information shows that both iPads have completely removed the physical SIM card slot, and all cellular network versions will only support eSIM.

Apple reminds that the cellular network version of iPad only supports China Unicom eSIM in mainland China. Browsing the web, sending emails and text messages can all be done anytime and anywhere.

It is worth noting that the new US version of iPad Pro also cuts off 5G millimeter wave and only supports Sub-6GHz, while the old US version of iPad Pro supports 5G millimeter wave Wave.

It is reported that the 5G millimeter wave frequency band has an ultra-large bandwidth ranging from 24GHz to 100GHz, giving it unique advantages such as higher uplink and downlink rates, lower latency and flexible and elastic air interface configuration, which can effectively meet the needs of the future. Wireless communications have requirements for system capacity, transmission rate and differentiated applications.

However, 5G millimeter wave also has some disadvantages. For example, millimeter wave signal propagation in the atmosphere is easily affected by oxygen absorption, air humidity, rain, snow and fog, and the signal is easy to attenuate. At the same time, millimeter wave signal penetration It has poor power and is easily blocked by objects, and these factors further lead to problems such as small millimeter wave signal coverage.

Apple iPad Pro cuts off 5G millimeter wave, which may be related to limited use scenarios.

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