If you run a small service business and your website gets inquiries that turn out to be outside what you actually offer, the problem is usually not the customer being difficult but the site failing to draw a clear line. A visitor on a phone screen sees even less of your page than you might expect, so scope statements buried three paragraphs down or hidden behind a menu rarely do their job. The first thing to check is whether someone can understand, within a few seconds of landing on your page, what you do, where you do it, and what they should not expect.
A practical way to tighten this is to write a short scope block that sits near your main call to action. It does not need to be a legal document. A few plain sentences naming the services you provide, the area you cover, and any common exclusions give visitors a chance to self-screen before they reach out, which can reduce the number of mismatched inquiries you receive. For example, if you handle residential cleaning but not commercial contracts, say so directly. If you only serve a specific set of neighborhoods, list them or describe the radius. This gives both you and the visitor something concrete to check against before a conversation starts, though some requests will still slip through.
Delivery boundaries are a separate but related issue. Customers often want to know what happens after they reach out: whether they get a firm quote or an estimate, whether there is a call-out fee, how quickly you respond, and what happens if the job turns out larger than described. None of this requires a terms-and-conditions page. A brief section that answers these questions in everyday language can reduce the back-and-forth that eats into your working hours. On a phone, keep each answer to one or two sentences so the visitor can scan them without pinching or scrolling through dense text.
The reason device format matters here is not about design trends but about reading behavior. On a desktop, a visitor might scroll through a longer page and pick up details along the way. On a phone, people tend to look for one or two specific answers and leave if they cannot find them quickly. So the information that prevents misunderstandings needs to be visible early and stated concisely. You can test this yourself by opening your own site on a phone you do not normally use and seeing whether the scope and delivery details are obvious without tapping through multiple sections.
None of this guarantees that every inquiry will be a perfect fit, and you will still get the occasional request that falls outside your range. But making the boundaries explicit and easy to find on any screen size gives you a practical way to lower the volume of mismatched contacts over time, and it lets you spend more of your attention on work you actually want to take on.