The FBR has said that it will start blocking SIMs for non-filers in phases. In the first phase, the FBR will block SIMs of non-filers who have been issued notices and have not complied. In the second phase, the FBR will block SIMs of all non-filers.

The FBR has said that it is taking this step because it is concerned that there are a large number of people who are not paying taxes. The FBR estimates that there are over 10 million non-filers in Pakistan. The FBR believes that blocking SIMs for non-filers will encourage them to file their taxes.

The FBR has also said that it will provide a grace period for non-filers to file their taxes before their SIMs are blocked. The grace period will be announced in the coming days.

The FBR's decision to block SIMs for non-filers has been met with mixed reactions. Some people have praised the FBR for taking this step, while others have criticized it as an overreach of government power.

The FBR has said that it is committed to expanding the tax base and increasing tax compliance. The FBR believes that blocking SIMs for non-filers is a necessary step to achieve these goals.