Create a custom IMEI checker box for my website to check blacklist devices

I need to create an IMEI / ESN checker script for my website so we can check blacklist devices in the major US carriers ATT, Sprint, Verizon and Tmobile we also need to check if the device is being financed, or if its currently active on an account a good example is here [login to view URL] please post your best price we need it asap