At least in the UK, they could and did. My rate was doubled from 2p per minute to 4p per minute, to "harmonize" with the roaming legislation. My domestic rate increased to 15p per minute.
Other friends who are on pay-as-you-go report similar changes.
I pretty much agree with this position, although I find the "fill ... together" and "bring ... together" metaphors silly.
For example, if you have two jars containing 50 plutionium coins each, putting all of them in the same jar will have some unforeseen consequences. However, this does not change the fact that there are 100 coins altogether.
It seems like there's a fine line between having a toddler and having a hostage from the same species. You go to somebody's house, they're like, "Close the door. He'll get out. CLOSE THE DOOR! HE'LL GET OUT!" Okay. What kind of relationship do you have with this kid, exactly?
People who think that high-level reasoning is easy compared to sensorimotor skills have successfully implemented neither and lack both.
-- Benjamin Franklin
Neural networks can be used to balance robots. They can't be used to generate Agda proofs of non-trivial theorems, or C programs that do something useful, etc.
Other friends who are on pay-as-you-go report similar changes.