CDMA iphone 4 straight talk internet is working?

CDMA iphone 4 straight talk internet is working? I bought an iPhone 4 from Wal Mart about a week and a half ago and today the internet stopped working. Safari pages won't load, Instagram won't load, or apps won't download. And I can't get a SIM card because CDMA iphones don't have a SIM slot for it. How can I fix? I tried EVERYTHING! Wi-Fi off, airplane mode off, resetting, and turning phone off.

If it was working before and now it's not working, and you didn't change anything on your phone, then there's a problem with Straight Talk's service. Call them and get it fixed.

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