Samsung Galaxy S4 a perfect smartphone in terms of dimensions and technical specifications, even if a little dated. I have been using Samsung Galaxy S4 for a long time and never encountered any type of problem, but after the update to KitKat 4.4 many users have reported facing different problems such as the one with the IMEI. But with patience and some time everything settles down, even correcting invalid IMEI on your S4.
A serious problem for theGalaxy S4 "IMEI is not valid"And for this it is necessary to find a solution immediately, considering that the Samsung Galaxy S4 is a device also used at a professional level. We have found a modofacile and working to solve this problem with the IMEI, read on and find out how.