Signal problem in both phones.Sim ka signal aty hi nahi hain jo bhi sim ho r khas tur pr ghar ma tu bilkul bhi nahi bahir nikalty hi signal aa jaty hain lakin ghar ma emergency call lagi rehti ha.S7 r S9 ka signal strength zyada ha lakin A series tu ...
Like a lots of app running at a time at background.Generally mid-range smartphones start laging at this point but i don't face this issue at S7 and S9 that's why I'm not switching.