The Federal Board of Revenue (FBR) has introduced a mechanism for blocking and unblocking mobile phone SIMs of non-tax filers.Telecom companies are required to reactivate SIMs of tax filers within 1 to 2 business days after receiving an automated list from the FBR.Taxpayers experiencing delays or unresolved issues can contact their Commissioner for resolution.Non-compliance with the Income Tax General Order may result in legal repercussions for service providers.