Because this year, the US version of the iPhone 14 series no longer retains the SIM card slot, but is replaced by e SIM technology. In this regard, the four major domestic operators, China Mobile, China Telecom, China Unicom and China Radio and Television, all indicated that they did not support the mobile phone eSIM service, so consumers should carefully consider buying it.
It is understood that eSIM means that the SIM card is built into the device and configured and updated by wireless remote download. ESIM allows users to use cellular networks without the support of traditional physical SIM card slots.
technical description
ESIM card, also known as embedded SIM card, simply means that the traditional SIM card is directly embedded into the device chip, instead of being added to the device as an independent detachable component, so the user does not need to insert a physical SIM card as it is now.
The traditional Sim card locks users in a service network, while the embedded Sim card can make users of smart phones, tablets or wearable devices avoid being limited to one operator's service, and it can immediately switch to other service networks without replacing the Sim card.
The emergence of eSIM means that the era of surfing the internet and voice calls only by mobile phones is coming to an end. There will be more wearable smart devices to achieve functional independence, and Internet access and telephone voice will no longer be exclusive to mobile phones.