Simple Mobile on a Sprint locked Iphone 5?

I'm using a R-Sim 9 on a locked Sprint Iphone 5.

My carrier is Simple mobile. I just activated a phone, cut my sim card to fit etc…

I can send/receive calls as well as receive texts. However, I can't send texts, get online (other than Wi-Fi), or reach my voicemail.

Is there something I'm missing? It seems weird to have service but only have certain things work

If you want all the services to work properly, you will need to get the phone factory unlocked and not just use any R-SIM for fake unlock. If you need help with getting the phone factory unlocked, mail me for references.