Wall Voltage in 3Phase
When we say the voltage from the wall is 220 Vrms is that the
  line-line voltage or is that the phase voltage


Usually, the output winding at the substation that feeds domestic buildings is a Y formation. This means it produces three phase voltages and one neutral. What should be wired to a wall socket is one phase voltage (live) and the neutral.

But there are variations and what I've described above is typical for UK outlets.

So, if the phase voltage is 230 volts (UK), the line (or phase to phase) voltage is \$\sqrt3\$ higher at 398 volts. If the phase voltage is 240 volts then the line voltage is 415 volts.