4 lighting circuits - easiest, cheapest Wi‑Fi smartphone control?

Hi. I have been reading the forum posts for a while to find the best solution and with each post I know less:) .
I have 4 lighting circuits that I would like to switch on with a smartphone via wifi, what is the cheapest and best product I could choose to accomplish this task.
Please help.

http://www.kamami.pl/index.php?productID=199136

Connect the relays to this kit and you can control via WiFi.

Thanks mate for your help. And what is the price of this kit?
I found a sterbox controller on allegro for 8 hundred
http://allegro.pl/inteligentny-dom-internet-zdalne-sterowanie-plc-i3753370194.html
Is it worth using it for this price?

Zipato Controller. You will find Link You can connect relays from different technologies to the controller.

Essential question - are we talking about wired or wireless systems?
If you have the ability to plug into the lamp circuits in the switchboard then a sterbox will be just fine. If you're looking for wireless pips to fit into a lamp fixture or under a switch, then you have a few options:
- Delta dore
- Z-wave
- F&Home Radio
- Zamel?

Personally, I recommend Delta Dore because you have a 5 year warranty on each component and the price is swallowable (180 net for the module and 1100 net for the Tydom 2000 control panel). When it comes to z-wave it's best to buy the cheapest Vera. Zamel probably comes out cheapest, but I haven't tested it.

Hello,
i would suggest:
a) Fatek PLC e.g. FBs-10MA (6 I/O/4wy) 450 PLN gross
b) 10BaseT communication board e.g. FBs-CBE (1 10Mb Ethernet) 400 PLN gross
c) my free program IQarium - 0 PLN

total about 850 PLN

dm