Why can't Skype calls and IP-telephony work on iPhone 4s?

Question

iPhone

When calling Skype on an iPhone! Call not going through! It is the same in ah-pi telephony installed on the iPhone!
Notifications are set.
It seems that the programs are launched every time in a new way!
Maybe you can somehow add programs to autorun?

Answer 1

in iPhone 4c, the latest buggy firmware is probably installed, which eats all the RAM, so other applications are open ... iOS closes Skype itself when you exit it. To free up RAM. , I have the same .. neither messages nor calls reach from Skype