WordPress
Step 1: Login to your WordPress account.
Step 2: Go to the dashboard of your blog page.
Step 3: Click on “Appearance → Themes” on the side pane.
Step 4: Choose a theme which is responsive from the list of themes.
Step 5: The theme will take care of showing mobile version on mobile phones.
Weebly
Step 1: Login to weebly.com/uk
Step 2: Click on edit which appears next to your blog site. This will take you to editing your blog.
Step 3: Click on settings on the top.
Step 4: Choose to Display the mobile-optimized version of this website when someone visits from a mobile device under Mobile Section.
Weebly
Squarespace
Step 1: Log in to your Squarespace account.
Step 2: Click on the gear icon at the bottom of the page.
Step 3: You will be taken to the settings page. Click on gear icon (settings) on the left pane.
Step 4: In that settings page, select general on the side pane.
Step 5: In that general page, scroll down you will get an option saying disable mobile styles.
Step 6: Click on the save button on top right corner.
Squarespace