Some advice from me: Talking to Nick prefer to use end-to-end encrypted Internet communication instead of regular cell phone services. There has been some leaks that there is a threat of Russians controlling telecommunication companies in Ukraine with potential to listen to people's conversations and capturing SMS messages. It's not possible with encrypted messaging, though. If you e-mail someone some important information you may also want to encrypt that message. Also if you are using Telegram to chat note that text chats aren't encrypted by default and you need to use secret chats to enable it.
Another thing is that telephone numbers can be spoofed. This may happen even without control over the communication companies. It happens also in other countries. That means you can receive SMS or a call from a phone number that never send it. This is just somebody else spoofing that number. Knowing that if somebody calls you and tries to retrieve some information from you (about you, Nick, your family or the army) and you don't recognise the person's voice (or aren't sure about the SMS author) - call back this number instead of talking to the person that called you. That way you will disconnect spoofed call and connect to real phone having such number instead.