It seems that about 50% of the text messages that I send to my friends (T-Mobile) are delayed (not received by the recipient instantly). The delay is usually about 3 minutes, but in one instance it took 2 hours, 15 minutes for the message to receive the recipient. The delay also applies about 50% of the time when my T-Mobile friends send me text messages (usually about 3 minutes, and I've never experienced a long delay when receiving). Is this a known issue or what? It doesn't seem to matter whether I am on the Sprint network or roaming on the Verizon network. The delay happens about half the time on both networks. My T-Mobile friends don't have problems sending sending texts to anyone else (although I am the only one with Sprint, everyone else has T-Mobile or Verizon).