Hello,
First of all remember that big devices such as phablets, tablets, laptops, desktops etc. Have more wifi reception power than phones. It is very much possible that if your ate using your iphone and macbook together at one time... On one wifi then the macbook wil be quite faster than the on...
Nokia bubbles has been a very successfull acheivement by nokia, i need a similar lock which is not an applocation but it is installed directly in system... Preferably a numbrr or a word lock. Please give some suggessions if any.