Unable to send text messages and customer service stinks.
For 6 months my LG420g phone worked perfectly. then i had trouble sending to e-mail address could never send a picture to FB mobile and finally could not send simple text messages, only mms. After hours on hold and hours with customer service (they even sent a new phone and a new SIM card when that phone didn't work) I finally found someone who identified a "bug" in the handset where it sticks at mms after sending a picture. This took 3 weeks.
She told me a way to turn off some settings (I hope I remember how) to get back to sending simple text messages. The replacement phone had the same problem as the original phone.
Thanks for your comments.