[Completed] no 3g internet connection on LG L40G

I have a Straight Talk LG L40G that is not rooted, everything was working fine until about a week ago. My wifi is working to access the internet, but my 3G is not. I can make and receive phone calls but I cannot connect internet via 3g. I have been in contact with straight talk but to no avail, we tried everything. I have data enabled, cleared cache,history,cookies. Tuned on airplane mode and then turned off, Have shut off and on again, Have removed battery. Even did a factory reset, but to no avail. The 3g internet is not working. I also restored internet to default. I am at my wits end. Please point me in the right direction. I am hoping someone can help me, please. Straight talk says they have been doing some updates to my phone, but so far that is not working either. Please does anyone know why my 3g is not working anymore?

already checked APN with straight talk

That was just about one of the first things that was checked by Straight Talk. I wish I knew what the problem was. Like I said everything was working until about a week ago.

I have android 4.0.3. It was working good until about a week ago. I haven't done anything different so I am assuming it has to be on Straight Talks end. They don't seem to know how to fix it though, so I may be stuck using the phone like this for awhile.