how to update a straight talk phone
Your Straight Talk phone should be set to update automatically. You may have to turn your phone off and back on to update it. You will also need to buy a plan card from Walmart in order to add time to your Straight Talk phone.
If by 'how to update a Straight Talk phone' you mean how to upgrade it, then you just have to log onto Straight Talk.com/activate and click on the 'radio' button to activate your upgrade. Look here for more information: http://www.straighttalk.com/controller.block?__blockname=straight.faq.category.landing&category=upgrade.