How to clear ram on unx u683cl

Clear ram umx u683cl 

How do u clean Ram off you unimac U683CL assurance wireless phone even if it's a government phone I really hate this phone with a passion but too afraid to get it replaced because they will suspend my service untill I get my new phone and that could be weeks and I need a phone 24-7 because I have a child in school and I can't miss those calls so plz help me out

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