network problems

As I know A5 2017 has great networking system the problem may be because of the Operator Call and get the problem to solve

When you're experiencing slow speeds turn your phone into airplane mode and then turn it off. Your speed should be back to normal again

Why secure folder not have the message application to use send/receive text message to secure contacts. There is secure applictaion of contacts that will use to make secure calls. Please make this feature enable that secure folder have a secure message application for secure contacts. Because if we send message to secure contact it will appears in message application and no secure text message sent to secure contacts. Please develop and send an update.

when i use internet that time network to much slow and downloading is slow also browsing
slow