Your website may display the following message after installing the free ecommerce Magento Mobile Extension.
If this message is displayed on your website, follow the given steps:
1. Login to your Magento Admin Panel.
2. Search for a file named maintenance.flag in your Magento root and delete it.
This file is created temporarily while Magento performs certain tasks. If this file is found in the backend, the “Service Temporarily Unavailable” message will be displayed on the website. So, to avoid this, you can simply remove the maintenance.flag file.