Thanks again for your recommendations, dekbit98!
No problem, I am here to serve (and not protect) 
Last, but not least, the wallet work also with Tor. However, I was unable to start Tor. When I select, from app's menu, to activate Tor, it remains in infinite loading. I am not sure if this is a problem determined by my phone or if it is a known bug. However, even if it is a bug, it can be fixed. And having the wallet work through Tor is one of the most safe feature possible.
I think this is the issue with Tor and Network DDoS that is still not resolved, and it is affecting many bitcoin related services and wallets.You could try contacting Unstoppable support channels (reddit, telegram, discord, twitter, etc) and ask them for help, it could be something else or they need to release updated version.
Quote
We are experiencing a network-wide DDoS attempt impacting the performance of the Tor network, which includes both onion services and non-onion services traffic. We are currently investigating potential mitigations.
Update, 2022-07-07 13:00UTC: the overload we saw in the past few weeks seems to be gone now and performance improved over the last couple of days. However, the DDoS is not over yet, but changed its nature. We are currently investigating how we can mitigate the new overload
https://status.torproject.org/Update, 2022-07-07 13:00UTC: the overload we saw in the past few weeks seems to be gone now and performance improved over the last couple of days. However, the DDoS is not over yet, but changed its nature. We are currently investigating how we can mitigate the new overload