Hello all,
I am trying to do this:
Do you think is this possible?
And also could you please some diection to look.
Thank you.
What you should look for is “failover”.
There are different ways to do that, if you search the forum for that keyword you will find many examples.
Your specific case may be more complex than others depending on how you are using the radio(s) on your Mikrotik router, usually in configurations like yours these Mikrotik routers with wi-fi are set as AP (Access Point), i..e. they provide via DHCP an IP address (and Internet) to devices that connect to them, what you are willing to do somehow “inverts” the logic, it is the Mikrotik that needs to connect to your phone and go through it to reach the internet.
Very likely it is doable (almost anything is possible on a Mikrotik device) but it might be not easy-peasy.
First thing that come to my mind is that your phone will need to have always the same IP address (in itself not an issue on the Mikrotik side as you can assign a static DHCP address to a given MAC) but with some phones that do "MAC address randomization) may be an issue, otherwise you could setup a DHCP client on the mobile phone hotspot, but in that case I think you need to "dedicate a radio to this, here is an example of this latter kind of setup:
http://forum.mikrotik.com/t/failover-wan-thru-wifi-bridge/167800/1