I own an LG Quantum, and when I send the messages they appear to go through, but they don't. I've been sitting next to multiple people and have sent them at 160+ char message, and they never get it. The shorter messages send fine. I've never seen this problem before. If anyone could help it would be greatly appreciated.
I am having the same problem, and it is VERY frustrating. I have the HTC surround... which is Windows Mobile, just like your LG Quantum. I have three others phones on my line that are Android or the Iphone and they get sent. I am assuming its Windows.