LG L33L Won't connect to wifi. Stays on 2 seconds then drops off.

Did not like new Tracfone so I transferred minutes and data back to older LG phone. Was sent new SIM card because old one was expired (I guess no days left?) now when I try to connect to wifi it connects for 2 seconds and then drops off. I tried every thing, Reboot, took battery out, re boot router, without success.. The newer phone will connect to wifi and my lap top and tablet will but LG wont. I took it to public (un protected) wifi spot and it connected. HELP ! Jimbo

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