Hi alus415. My name is Straight Talk Larry. I will be answering your questions:
1. 3G and 4G services are available if the carrier in the area has the capability and the phone has the capability as well. Not all areas support 3G or 4G but if you move from area to area, you can expect the type of service to change based on what is available in the area.
2. The APN settings must be updated in order for the MMS feature to work. Please note that updating your APN settings does not guarantee MMS (Multimedia/Picture Messaging) will work. MMS is dependent upon your phone model's limitations.
3. Though we offer unlimited browsing, but not for audio/video streaming or using your phone as a modem for your Laptops or Personal Computers. This kind of usage will have a great impact on the carrier’s network and service level and may result into system issues. Use the phone’s WiFi connection should you need to use it for video/audio streaming or any activity that will require large amount of data.
3. Please refer to this link to view the service area map; http://www.straighttalk.com/coverage
. Data connection speed can also be affected by network congestion. Thanks!