Based from what I've said above about custodial wallets, as long as both wallets contain the same private keys, they'll work simultaneously without issues even if it's not the same wallet.
You can achieve that by restoring the wallet's backup (usually a 12/24-word phrase) to the other, but some aren't compatible.
Note: Given that you want to use it in both platforms and will contain the same keys, if one was compromised, the other will be as well.
TL;DR
One simple answer: By looking at your other post, wallets do not contain free bitcoins even in the early days of Bitcoin,
most wallets are free to use and I don't think there are any "pay-to-use Bitcoin wallets".
Do an extensive research about "custodial wallets" and after you gained confidence, you can now use that wallet.
Here's the board for wallet software where you can ask questions: https://bitcointalk.org/index.php?board=37.0