【涨知识】手机或手机号码更换了，无法登录个人所得税App怎么办？请看这里！

Group 1 - The article provides solutions for taxpayers who are unable to log into the personal income tax app due to changes in their mobile phone number or device [1][2][3] - For users who changed their phone number but not their device, they can verify their identity using the old phone number or their bank card [1][2] - If both the phone number and device have changed, users must log into the natural person electronic tax bureau website and follow the prompts to change their phone number [2][3] Group 2 - The article also mentions a tax policy for second-hand car dealers, allowing them to pay a reduced VAT rate of 0.5% instead of the standard 3% [9] - This policy applies to second-hand cars that have completed registration and are not yet scrapped, and it will be in effect until December 31, 2027 [9][10]