Your Sling Money Wallet is self-custodial. This means that it belongs to you, and you can do whatever you want with it, including exporting it into other wallet software like Phantom Wallet.
That said, we recommend limiting the number of devices you use to access your Sling Money Wallet for your safety and security. We carefully monitor the use of your Sling Money Wallet, and if we detect signs that you may have lost control of your private keys, we may temporarily suspend access to our on-ramps and off-ramps while we investigate.