Do you have any more details on this? I always thought that once the PDP context is established (which is based on the phone providing an APN and optional crede

Do you have any more details on this? I always thought that once the PDP context is established (which is based on the phone providing an APN and optional credentials, not the SIM), the "tunneling" (if any - local breakout is a thing apparently) is handled by the network and is completely transparent and invisible to the phone.