Before porting phone numbers from one carrier to another, it's crucial to ask the right questions and prepare accordingly to avoid potential pitfalls. Key points include ensuring effective communication throughout the process, checking the portability of numbers, understanding the current carrier's port out process, confirming active status of numbers, verifying pending orders on existing accounts, assessing compatibility with new carrier features, identifying the Billing Telephone Number (BTN), and obtaining account number and PIN from the current carrier.