The answer here is simple and it is close to being a "bait and switch" type violation of the consumer protection act.
The Samsung S380c offered through Straight Talk does not do SMS, MMS or Vm notification. A call to Samsung indicates that this model does INDEED HAVE the capability to do notification. At the lowest levels this is obvious by the fact the the firmware on the phone DOES INDEED let you select ringtones for Text Notification. You find this by going to the menu and then selecting "settings" and then to "Sound Settings". In "Sound Settings" you find options for "1) Voice Calls" and then "2)Messages". After that you get an option to select sound settings for "Text Message". The "Text Message" menu gives you the ability to select a ringtone to use for the ringer type for text messages.
It can not be much more clear than that. The firmware on the phone DOES INDEED HAVE THE OPTION TO SET RINGTONES FOR TEXT (SMS) MESSAGES just as the manufacturer indicates. The problem is exactly as Samsung indicates also. The Straight Talk service, for undisclosed reason, does not alert the owner of the phone that text messages (SMS), multimedia messages (MMS) or voice mail (VM) has arrived. This, perhaps, is a cost saving issue by StraightTalk but the fact remains that the Samsung S380C has the capability to alert the owner to SMS, MMS and VM through it's firmware but StraightTalk, as a service, does not. Fot the company to say that the issue is the device is a total fabrication.
It goes a step worse than that. If you browse out to the phone from the StraighTalk Webstore, as of this date, you will NOT find any mention of SMS and MMS not being supported. Looking at other models you will find that they nowhere state that it IS supported and it is left to the owner to presume that this standard feature, to most all services, is also standard to the S380c. The bullet points for this model, in the StraightTalk Webstore description, actually DOES go so far as to say that "vibration alerts" are support. Nowhere is it ever disclosed that text message alerts are not support (it is key to note that this model replace an older Samsung model that DOES INDEED support SMS, MMS and VM notifications.
Several calls to StraightTalk support, on direct advice from Samsung for resolution, gives the owner only one solution. StraightTalk Support directs to return the phone to Wal-Mart for an exchange (which if you exchange for another S380C you do NOT fix the problem as it is NOT fixed...after all StraightTalk says it doesn't work so why do they tell you to exchange it) or exchange the phone for a model of higher price (a forced upgrade).
To me the issue is simple. The phone was sold under false pretenses and the proposed solution is to spend more money for a device I did not select. I have a strong notion, having been tech support for AT&T and Sprint, that the issue is the costs to StraightTalk for SMS, MMS and VM notifications. This seems to be a cost savings effort on the part of the service provider as it is ABUNDANTLY CLEAR that the Samsung S380c does in fact HAVE the capability to deliver notifications. A few searches on Google will show you that.
After 4 years StraightTalk....really??? This is the only time in my cell phone history do I actually feel completely and purposely RIPPED OFF by a carrier and a call to the FCC, Better Business Bureau, Consumer Protection agencies might make me feel better. Or perhaps porting to another carrier.