The MMS settings for the Sprint network has been added below. Note that there are also the MMS settings for the AT&T network as well as those for T-Mobile and Verizon. You can use the MMS settings below for your mobile phone and you can also search this website for the APN settings for the Sprint network in the USA. There is also the Samsung USB driver should you be using a Samsung phone on the Sprint network.
Sprint MMS APN Settings
Settings > Mobile network settings > Access point names
Enter name: Sprint MMS
MMS Proxy: 184.108.40.206
MMS Port: 80
APN type: mms
Keep default values for all blank fields shown above.
Press menu button (top right) and select Save. Done.