Any given LoRaWAN device can be associated with only one network infrastructure provider. For example, a device that uses the TTI network infrastructure can only communicate to a Cloud Server that uses the TTI controlled LoRaWAN Join server. The same applies to a device that uses Actility as its resource provider.
The repersonalization key has been defined to allow a given LoRaWAN node to be securely re-keyed to another network infrastructure provider. The repersonalization key is a diversified key that is used to derive a new set of network and application parent (NwkKey/AppKey) keys stored in Slot 0.
If you want to transfer your LoRaWAN node off of the service provider's network, contact the service provider to obtain the necessary information.