1) for the “Notification template” I checked this and I found that this this template is not coming from the EN.com it is statically coded on the EN.net API side. and Seems it need fix the design of it.
2) I will check that and get back to you.
3) For Carrier Lookup Page : There are two types of form submission on the PHP/HTML on is as Default form submission, and Second one is with Ajax.
The Default Form submit reload the page every time when it displays Result. And it response time depends on the server response, If the Server respond slow then it take time to submit and get result. On other side when Ajax from submission it Send request silently and get it response and developer will manage this data on the front side, It’s Response time will also affect with Server response time but in this we can put that Loading image while it processing.
Currently Carrier Lookup Page is working with the default HTML form submit.
I hope i could Explain it better.