MobileVoip on iphone5 no more connect to my home/house wifi

[Rey]

Hi everyone, I am new to this forum. I have a disturbing problem with my Iphone 5. When i first had it, i installed "Mobilevioip" from Apple store to enable me make cheap calls to my country. Just 2 days ago i had problem with my itunes been unable to connect to Itunes store. Just to cut the story short, i uninstalled and reinstalled MegaVoip and presently it can connect to the shops network I went to lay complaint but can no longer connect to my home wifi even though my iphone connects well to my wifi, i access other sites; Facebook and all but MobileVoip would not connect. I've done everything i could think of, uninstalling and reinstalling over and over again but to no avail. Someone please help.