My samsung tocco sim is full but won't let me alter the save settings.?

When I first got the phone I had no problems with texting. As far as I knew all messages were being saved to my phones memory and not the sims. Last week however it has started telling me that the sim memory on my phone is full and messages need to be deleted. This means my phone is only allowing me to get 20 texts, and that is provided I delete all of them. What do i do?

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hey vous savez ce qui m'arrive avec mon téléphone, il affirme qu'il est censé dehecho que j'ai la place pour 500 messages et je reçois cette mémoire est pleine et j'ai 200 et j'ai juste une autre forme 20 ne sais pas si la carte SIM ou la carte SD! si vous savez que je peux faire s'il vous plaît alertes