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I'd recommend that you reset your network settings once your Optus SIM is in the phone. This will then force the phone to look for a suitable network to connect to.
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Hi @Marik026, you first need to make sure International Roaming is turned ON. You can confirm this if you have access to the Optus app (via Wi-Fi). Check out this → support page for more info.
If it is turned ON then also make sure Data roaming is turned ON and Network mode in settings of the phone is set to automatic. If everything seems ON and it is still not working then you are best to speak with our Support team either via the → messaging service or if you have a social media account then please send a PM to Optus on Facebook or a DM on Twitter with the details for further assistance.