How to prove your relationship with your Thai Partner to apply for an overseas visa
What you should do while at home
Make contact with your Thai partner in anyway that can produce evidence. Without any evidence it is difficult to suggest you are in a real relationship.
The embassy will need to see contact via telephone or internet calling. Landlines and contract phones are great as you get a monthly bill which will show all of the times you have contacted your Thai partner.
Once a week call you Thai partner for 1 minute from any phone that will provide a bill with her number on it.
Skype or messenger
You are able to print off your skype or messenger history. I strongly suggest you print it off on a regular basis. This is because the history of this contact is kept on your computer and if you lose the computer or the hard drive fails you will lose all of your contact history.
You should be sending emails at least twice a week to your Partner and she should be sending emails back. Print the emails on a weekly basis.