Does iPad Pro M4 Have SIM Card Slot? no
So, engineers have removed the physical SIM card slot from the iPad Pro (M4) and iPad Air 6. Now, in models with mobile support, you can use only eSIM.
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PSAM Card Slot. 1* PSAM. SIM Card Slot. 1* MicroSD (TF) (Config 1) 2* NANO SIM or 1* NANO SIM +1* MicroSD (TF) (Config 2). eSIM. Yes (Config 2). Network. 2G ...
Learn which size SIM your iPhone or iPad uses - Apple Support
One of the differences worth noting is the lack of a physical SIM card slot. On the previous generation models, the cellular versions of both the iPad Air and the iPad Pro included a physical SIM card slot.