Pretty much relying on the assumption that investigators will find stationary phones suspicious when they spy on you
Could put them in those charging lockboxes seen as airports and festivals, the infrastructure is already there
Guess I’ll market it to climate activists in europe lol
edit: maybe those delivery robots are even better couriers, since it fits the idea of getting a courier to come back to you better than an uber on the other side of town. risky but the fun kind.