Help mobile network no longer works

[macseven6]

i got an elephone p8 a few days ago swapped sim cards from my nokia lumia 520 and now i no longer have mobile internet .calls and texting work but i no longer have mobile.

the elephone is on the most recent andriod os

 

[Hadron]

Check the phone's APN Settings (Access Point Names, under Settings > Mobile Data). These need to be right for the network your SIM comes from. You should be able to find your carrier's settings via their website or a quick web search.

 

[macseven6]

i found the apn changed it to what striaght talk said to and its still not working and now when i go back to try and change it again its not white and wont let me click on it at all