If that's ALL you've got, or is your 'last resort'...or after ALL other methods have proved 'unsucessful'...or, IF you think that would be the most efficient...then CERTAINLY mate!
On the other hand, you could employ your EPIRB, but you won't be able to actually talk to anyone on that, but you will get assistance eventually....
This of course is predicated that no-one happens to be in 'your area' at this time...Like I suggested, do you want to have to RELY on this in an emergency?
Can happen quite often, in my experience....just depends on 'where U is' in relation to other aircraft routes / times...
Cheers...