I had cut my old SIM (AquaFish) by myself. It worked. However, I went to Telia shop (In Finland) and asked to get a new nanoSIM, It did not work on my Xperia with SailFishX. Two days earlier I got a new nanoSIM for my brother's XperiaX. It worked without problems.

Now I use my old SIM and haven't made any further testing with the new one. I activated the old SIM in Telia Finland web pages by myself.

EDIT:
Maybe you can find some help here:
http://talk.maemo.org/showpost.php?p...postcount=1777