I heard it is possible to get out of an Orange contract as they have been taken over by t-mobile. Is this true?

No, it's not possible to get out of your contract for this reason, as long as they provide the same services.

It is, indeed, not possible to get out of your orange contract for that reason. It is, however possible. Because Orange cancelled their webmail service. Officially you must have made use of this service, but some people who didn't, allso ended their contracts succesfully. For more information, see this tread, over at allaboutphones.nl. (translated into english with google translate) click

Dutch law is quite simple in these cases. If a contract is changed in content (so not just some sentences) it is possible to cancel it.

So if Orange changed its services or prices as stated in your original contract, however small it may be, you are allowed to cancel the contract without penalties.

Nice to know: this law applies basically to all contracts, not only contracts with telecom operators. For example; many people changed their insurances without penalties when banks and insurrance companies added an anti-terror clausule in the contracts after 9/11.