When You use a normal SIM-card, this card is linked to a certain person. On first sight, this might been seen as a huge disadvantage.
However, most certainly when facing
strong adversary like a government there are many ways to link a person to a SIM-card:
where a certain person goes, that SIM-card goes;
where a phone with a SIM-card in it that is linked to a certain person goes, that SIM-card goes etcetera.
It is simply a fact: just walking around with a mobile phone opens up a large part of your live to a strong
adversary: where you live, when you sleep, where you have been etcetera.
Using a "special" SIM-card is not helping that much. In fact, it might flag your phone as "special", a phone that needs special attention.