Why won't my phone send text messages?

Why wont my phone send text messages?

So, i have a sony ericsson w380i, and i have had it for abit after receiving it from my sister because she got a new phone, but suddenly it just stopped sending text messages, however i can receive text messages and calls. Does any1 know whats wrong? Its REALLY frustrating! My sim card is TESCO.
Answer:

What I recommend doing is to update the software of your phone. If you have the USB cable for your phone, you can visit the Sony Ericsson website at www.sonyericsson.com under the support section and select your model phone. You can go to "Software Downloads" to download the update program on your computer and install it. Once you start it up, it will give you step by step instructions showing you how to update your phone. -Roan Sony Ericsson Answers Team

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