Transfer your account and current US number to the cheapest pay as you go provider you can find. Tello for $5/month, for example. Use a real cell phone provider (non-VOIP) that allows wifi calling, so you can occasionally check your messages from abroad and even do 2FA. Keep your payment details current. I’m from Canada but this worked for me (using 711 Speakout, which is not available in the US), during a 4-year stay in Europe.
Transfer your account and current US number to the cheapest pay as you go provider you can find. Tello for $5/month, for example. Use a real cell phone provider (non-VOIP) that allows wifi calling, so you can occasionally check your messages from abroad and even do 2FA. Keep your payment details current. I’m from Canada but this worked for me (using 711 Speakout, which is not available in the US), during a 4-year stay in Europe.