Help flashed phone to cricket bur says sprint network /not receiving all calls

[inglemegan]

I got my Sprint samsung conquer 4g flashed over tocricket .everything workef fine at first but noww im starting to have problems with receiving some of of my calls .people have been telling me thar everytime I call it goes straight to voicemail. I never get any notice that they called at all . All I get is there voicemail.also my internet always says data connectivity error and my playstore always timed out and asks to retry. I used to be able to send and receive pics but can't do. That now either.also it still says under settttings that my network is Sprint please help