If your email exceeds 102KB, Gmail will only display the first 102KB. After that it will clip off the remainder with a few different variations depending on the platform displaying the email. If it cuts off the end of the email, there will be a link to "View entire message." Selecting the link in the message will open a new window with the entire email downloaded.
Here are some differences in how this download message displays on mobile platforms:
Currently, for Android devices, there is no link for viewing the entire message.
The iPhone does display the link, it reads "[Message clipped] Download entire message", clicking this loads the entire message on the same window.
A link to view the entire message does not display. It just remains cut off.
What is the solution?
Try making your emails shorter. This email browser has a habit of cutting off long(ish) emails. The only real solution is to create shorter emails.