Hi Pranati,
There are many previous question on this forum dealing with this topic. Perhaps you can find a solution there?
https://forum.mendix.com/link/questions/109699
https://forum.mendix.com/link/questions/109543
https://forum.mendix.com/link/questions/101080
Follow the steps for common issues documented here
https://docs.mendix.com/howto/mobile/common-issues
I hope that solves your issue or points you in the right direction. You could also try making a hotspot on your phone and connecting your PC to it to test if it's a network restriction.