When you set up a contact or inquiry form on a business website, the first question is usually how many fields to include. On a phone screen, every additional field adds scrolling and tapping, so people are more likely to abandon the form if it feels long. A practical starting point is to list every piece of information you would like to collect, then mark which ones you truly need in order to reply or take action. Fields like a name, an email address or phone number, and a short message or subject selection are often enough to start a conversation. Everything else can be considered optional or moved to a later step.
Deciding between free-text inputs and structured options like dropdowns or radio buttons depends on what you plan to do with the answers. If you need to sort inquiries by category or route them to different teams, a dropdown or selection list keeps responses consistent and easier to process. If you are trying to understand a customer's specific situation, a short free-text box gives you more useful detail. On smaller screens, dropdowns can be harder to use if the list is very long, so keeping option lists short or grouping them helps.
For forms that must collect more information, such as a service quote request, splitting the form into two or three short steps can reduce the feeling of overwhelm on mobile devices. Each step should show a clear label so the person filling it out knows roughly how much is left. You can also make certain fields conditional, showing them only when a previous answer indicates they are relevant, rather than displaying everything at once.
A useful habit is to fill out your own form on a phone before publishing it. Pay attention to whether the keyboard type matches the field, such as a numeric keypad for phone numbers, and whether any field is too narrow to see what you typed. If you have access to real inquiry data after launch, review which fields are frequently left blank or where people stop, and adjust from there based on what you actually observe.