An affidavit for a change in address for a mobile bill is a legally binding document used to confirm and officially record the change of residence for billing purposes. It serves as a declaration by the mobile subscriber or account holder, stating the previous address and the new address to which the mobile bills and communications should be directed. This document is important for ensuring that mobile service providers have accurate billing information. It helps prevent communication errors, ensuring that important bills and notices reach the intended recipient at their updated address, maintaining the continuity of service and regulatory compliance.