Phone numbers in my messages are replaced by the Skype logo
This is an issue that is specific to your computer. If you are using the Skype add-on for your browser, any telephone number is replaced by the Skype logo automatically, so that you can dial the number with Skype by simply clicking on it.
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To disable    the Skype plug-in, you will need to use the visit the page in your browser where add-on's are managed, and then locate and disable the Skype add-on.
In Firefox 7.x, click on the Firefox button at the top left, and then select Add-on's
In Internet Explorer 9.x, click on the Settings icon, and then Manage Add-on's
In Google Chrome: Settings > Tools > Extensions
As an alternative, encode the number with this tool:
http://www.simplelogic.com/Developer/HTMLEncode.asp