wifi

I went in the hospital and my wifi that came with my phone,the hospitals wifi wouldn't let me make calls or text unless I switch to their network.So I did,but when I came home I was switching back to my own I don't remember the wifi name that was displayed on my phone and when I tried to log into my gateway it kept saying wrong password that was displayed.How do I change this,take the router back to the local T mobile store.

@3Cts your phone should have saved the credentials for your home network, and every other network it successfully connected to.  On your phone, open your settings, find the Wi-Fi section, and tap the name of your home network.  If this doesn't work or you still need to enter a password, you can find the original password (and original network name) on a label on the gateway.  This should work unless you changed it. If you did change it but you can't find it, you will need to reset the gateway.  I don't know the procedure for this without some research, so please see what you find and report back here.