If you're outside of cellphone range - which is pretty feasible even in near-to-civilization outdoors areas - and you become immobilized, you're stuck until a)

If you're outside of cellphone range - which is pretty feasible even in near-to-civilization outdoors areas - and you become immobilized, you're stuck until a) someone else happens across you - which could happen if you're actually on a fairly well traveled route, b) you don't return on time and your friends/family initiate a search - and hopefully you gave them an accurate trip plan and didn't deviate from the route, or c) press the SOS button on your PLB or satellite communicator. Depending on your condition, any additional delay of hours or days means it'll probably end up as a body recovery instead of a rescue. If it were me, I'd want get get help ASAP if I needed it. (Even if you're experienced, trained, equipped, and prepared, things can happen...)