sorry for answering late - I am very busy while writing my diploma degree paper. There are only a couple of weeks (I do it by the job)
I finally didn't buy this module because I hope TM will develop a 3G/4G Module this year.
The error is known:
@kevin wrote in this thread.
But I don't know whether he had done something - he is very busy (they are hiring)
Also don't forget: This (also hardware) is Open Source and needs help by contributors.
I would suppose you need leading 00 but I also would try it like you would do by using your phone within same country: without 00 and 49 ... but normal 0 of mobile number. In your case: "0152228xxxxx" and tell me what happens