I am trying to create a hotspot in my home ubuntu installation (12.04 Precise). The configuration seems OK and the hotspot is activated. However, the hotspot created by Ubuntu does not appear on other devices.

My iPhone can't see the hotspot. The same goes for my friend's Android device.

To create the hotspot, I used the standard GUI via

* System Settings > Network > Wireless
* Click "Start Hotspot"

Wait a few seconds and the notification appears informing the network was successfully configured. If I click the network icon in the top right corner of the screen, the hotspot is listed as connected. In the terminal, the network card even got an IP address

Code:
wlan0     Link encap:Ethernet  HWaddr NN:NN:NN:NN:NN:NN
          inet addr:10.42.0.1  Bcast:10.42.0.255  Mask:255.255.255.0
          inet6 addr: NNN::NNN:NNN:NNN:NNN/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:345 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:91818 (91.8 KB)
Am I missing something here? I also remember trying this with Ubuntu 11.10 without any luck.