I have been lucky and lost my old SIM that I last used for certain accounts. I couldn't recover the phone number before adding to MP either.
I added them back, knowing the correct PW, but not the correct SIM phone #, on a proxy located in the same city as the last time it logged in. Right after adding I could see the profile and changed the number. THEN I was PV'd. SO I was able to recover.
I would test the new SIM, but unless your in the same city as the last time it logged in, you might get PV'd.
I think you should do 1 or two test accounts to see what works.