Why won't my iphone from straighttalk send pictures?

Whenever i try to send pictures, it just says "message failed"
I can send pictures to other iphones but when i try to send it to a regular phone, it wil not let me.

Straight talk throttles data, you may be close to your limit for the day, or you're overthrew limit

You need to change the apn setting.use apn unlocker

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