Can you answer me this question will either of these phones still work going forward?

Samsung stratosphere II  or LG extrovert 2  I do not see them on  the list of discontinued phones.  both of them show up on their manufactures pages for supported phones Does that mean if they are on the supported list they will be going forward or just right now TILL the change?

I do not need the latest and greatest technology  just one that  will work going forward. quite honestly I don't want a "smart" phone