The free version of no-ip currently requires you to revalidate your host monthly.
Nothing prevents you from upgrading later to one of the offered plans.
Using a webservice of a server with dynamic DNS works independent of ANDROID or any other client. Just leave exposed the port you want to use in the firewall.
Example: Although port 80 is standard for HTML, you can place 8888 and remap locally on your server, modem or Firewal.
To get around this problem in another way, just hire the FIXED IP service of your operator, which is usually not expensive. And it’s worth more than waiting for the spread of DNS to the new IP. It takes around 30 minutes.
Need to be a cost-free solution? Why not invest in a VPS? There are several companies with reasonable VPS’s at low prices (5 dollars per month).
– Wakim
Interesting did not know the VPS, I will do a search and inform myself better, but from what I saw is like a VM on a server. can be a solution!
– Balrog
Because it’s being sealed off as "outside the scope"?
– Jorge B.