Does anybody know the USSD-Codes to initiate a callback for 09 Mobile, Globalsim, Travelsim and United Mobile?

Travelsim
http://www.travelsimshop.com/index.php?ACT=faq

When you still have problems please try: Send a text message to number ?9146?: enter in the text body the same like written above (*146*tragetNumber#). Text Messages to this number are free of charge.

I think that the content of the SMS is just the required USSD code :unsure:

Globalsim - if you mean a SIM from www.globalsim.net with the Isle of Man prefix +447624, then this might be helpful (another IoM -based SIm):
http://www.sim4theworld.co.uk/usefullinfo.asp#8a

*125*1*countrycode&number#. For example
UK Landline: *125*1*442071234567#

Someone mentioned on the forum that ithis code may be sent in SMS (just like in Travelsim), if the roaming "hosting" operator blocks USSD codes. However, I don't remeber the number to which the SMS should be sent :(

No idea about 09 and UM USSD codes....

The SMS number is: +44 7624 803766