Is I am surfing with the SIM 2 can the SIM 1 card receive incoming calls with a Dual Sim?

[zesman]

Dual Sim: Surfing while receiving an incoming call

Hi everybody,

I am planning to buy a dual sim mobile phone. One sim for cheap surfing and one sim for for calling. But i am unsure about some techniques of the technology.

If am surfing with sim2. Can the sim1 card receive incoming calls? Or is the sim1 blocked, as long as i am surfing?

best regards
zesman