They might be out of North America? Or might have phone in suspension.
@CliffeJif by chance you're in the US, be aware you can receive (but not send) texts if you stick your SIM in an unlocked handset. You'll have to endure a (seeming) barrage of "welcome to US, would you like to pay us to use your phone?" messages from PM, but you will also receive the text you want.
