You don't need to reconnect your blood pressure monitor to your Wi-Fi.
Just download the free iHealth MyVitals app on the App Store or Google Play depending on the model of your smartphone, and then sign in to your iHealth account to view all your old data.
*credit to Sylvain of iHealth Labs EU
https://helpcenter.ihealthlabs.eu/hc/en-gb/articles/115005419665-iHealth-Clear-BPM1-I-have-a-new-smartphone-what-do-I-need-to-do-