Dear, I have a android mobile, i am use in wifi network but some time mobile are not connect in wifi network, so what can i do?

Most WiFi networks are secured. Are you sure you are using the correct passphrase or password? FWIW, if a WiFi access point (AP) is using WEP, then you may need the entire 48 hex-digit key and not a passphrase. If WPA, then a passphrase should work. I have an android mobile as well (Samsung Galaxy S5) and have no problems, other than needing upon occasion a full 48 digit key for WEP-encoded connections. Most AP's these days use WPA, but there are still some WEP configured devices out there. My wife's old AP was WEP, and I had to use the 48 hex-digit key for that. She switched to a new device (the old one finally died) and is now using WPA, so the simpler passphrase works nicely.

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