I'm not sure if here is the right place to ask, migrate if you think it does not.
Recently I have a lot of problems with Apple's iMessage service. On a regular basis it tells me that the recipient is not able to receive iMessages at the time (since it's an ipod it is also not possible to send a regular text message). That person tells me however that she has no problem at the same time to send texts to other people via iMessage but also has trouble to send them to me. So it seems like a problem at my end. Could this be an issue with my provider? But I thought I also ran into that problem when connected to a WiFi. What are my options to check for a possible failure on my end?