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Mobile usability

Mobile website problems: 12 mistakes that cost businesses customers

8 min readVectora Systems editorial teamPublished: July 4, 2026Updated: July 11, 2026

For many local businesses, the first interaction with the website happens on a smartphone. During audits we often find pages that are technically responsive but still difficult to use: visitors cannot find a service, tap the right button, or complete an inquiry.

This article is based on recurring issues identified while reviewing commercial websites. Examples are generalised and do not reveal information about specific companies.

In this article
  1. 1. Text and buttons are too small
  2. 2. The opening screen fills the display but explains nothing
  3. 3. Navigation is difficult to use
  4. 4. Content extends beyond the viewport
  5. 5. Important controls are too close together
  6. 6. Forms are difficult to complete
  7. 7. Phone numbers are not clickable
  8. 8. Pop-ups cover the page
  9. 9. Card sections become excessively long
  10. 10. Images load slowly
  11. 11. Fixed controls cover content
  12. 12. Nobody tested the full mobile journey
  13. What the owner can check

1. Text and buttons are too small

Visitors should not need to pinch-zoom. Core text, contacts, and calls to action must be readable, with touch targets large enough for a finger.

2. The opening screen fills the display but explains nothing

A large image or decorative slider often pushes the service name and action below the fold. Mobile visitors need the offer and next step immediately.

3. Navigation is difficult to use

  • the menu icon is hard to notice
  • submenus do not open by touch
  • the close control is covered
  • the page remains locked after navigation

4. Content extends beyond the viewport

Tables, long headings, maps, videos, and forms can create horizontal scrolling. This is not only untidy; it can break the user journey.

5. Important controls are too close together

When phone, messenger, and menu controls have insufficient spacing, visitors easily tap the wrong item, especially in the header and fixed navigation.

6. Forms are difficult to complete

  • the keyboard covers the field
  • incorrect input types
  • errors appear only after submission
  • the submit button disappears behind the keyboard

7. Phone numbers are not clickable

On mobile, a number should start a call, email should open the mail app, and an address should open a map. Manual copying adds friction.

8. Pop-ups cover the page

Promotions, cookie banners, and chats can occupy most of the screen or become impossible to close. Test them on several viewport sizes.

9. Card sections become excessively long

A desktop grid stacked into one column may create endless scrolling. Reconsider order, copy length, and priority for mobile.

10. Images load slowly

Large unoptimised photos are especially painful on mobile data. Use modern formats, appropriate dimensions, and lazy loading for secondary images.

11. Fixed controls cover content

Call buttons, chats, and bottom bars must respect safe areas and avoid covering fields, text, or the submit button.

12. Nobody tested the full mobile journey

Opening the home page is not enough. Test the complete path from finding a service to a successful inquiry, including navigation, validation, and confirmation.

What the owner can check

Open the site without Wi-Fi, find the main service, try to call, submit a form, and navigate back. Any uncertainty is a valid improvement signal.

Related articles

Website conversion

Your website gets visits but few inquiries: 10 things to check

Forms and inquiries

Website forms are not delivering inquiries: how to detect the problem early

Trust and content

Why visitors do not trust a service website: 9 proofs businesses often miss

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