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When I try to connect to a free WiFi, my Xperia Android smartphone displays:
obtaining ip address
Or does it identify the WiFi router and is its IP address common for different smartphones/laptops?
Why does it happen: When you connect to a DHCP enabled router, your device (notebook, smartphone etc) obtains an IP address in order to access internet via that router/server.
Which IP is that, static or dynamic: It's a dynamic internal IP address and is valid only within that network.
Does this IP address identify my smartphone: Yes, but only in that network and it's actually the MAC address of your network adapter that identifies your device, not your IP.
The same is true for the router. It may have a static or dynamic IP which is given by the ISP. If it's static then yes it identifies it, otherwise no. Your external IP (router's IP) is different from your internal IP. All of the devices connected to that router have the same external IP address.
All of the devices connected to that router have the same external IP address. This is not necessarily the case, but if you're in a network where this isn't true, then you probably already know about it.
When it says that, while connecting over wifi, it means that the machine is asking the local network for connection information. On a basic level it's already connected. But when it says that, it doesn't yet have an IP address and thus can't yet transfer TCP nor UDP traffic (probably some other types too, like ICMP).
So it's really trying to get assigned an IP address for use on the local network, which is something handled by a DHCP service (usually in the router).
This is not special to the device type, it's just something that's a part of networking.
If your smartphone says "obtaining ip-address" it means it is searching for an IP address or connecting to an IP address. If you are trying to connect via Wi-Fi using the smartphone, it may be a static IP address or dynamic ip address. Your IP address won't identify the device, but the device has to obtain an IP address if you connect to the internet and the service provider will know about your device. Every device connected to the internet has its own IP address. Visit this site to check the internet IP address for your smartphone, iPad, PC or laptop.
