Core-based steering of roaming works until the device camps on the wrong network anyway, the visited network wins the retry battle, or the device sits in a forbidden-network state no OTA SMS can reach. Conventional multi-IMSI SIMs depend on slow OTA rounds or manual swaps. Meanwhile wholesale costs accrue by the megabyte, and every mis-steered device is either margin lost or experience degraded.
Preferred and forbidden network lists live in SIM files. IMSI identity lives in a SIM file. An applet with secure access to those files can steer, switch, and recover at the source — instantly on command, or autonomously by rule when there's no connectivity for a command to arrive on.
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Lower wholesale spend, higher attach success, and connectivity products you couldn't build with static SIMs — with steering decisions made where they take effect, and an audit trail behind every change.