Losing text messages on Xperia E1

[Peter311]

I keep finding random text messages I send are not being received, they just disappear so I have to resend! I've complained to O2 but they say no problem with my mast! Any ideas on how to solve this annoying problem, is my phone faulty?!!

[Peter311]

I'm STILL losing my texts... 2 more this evening, one from a different location, which suggests my phone is faulty?!