IMessage not sending or recieving?

It was workin just fine && it randomly stopped working… Can't get or send imessage. My Wi-Fi n 4g is always on. Whenever I try to send a imessage, it just takes very long to load… And it doesn't load.so I just change it to text… Tried reset network settings and send/receive imessage is on and my settings are all right… Only text message is working. I'm worried cuz I'm not getting any texts cuz most of my frends have iphones. I have an 4s thts ios6 n I can't update 2 ios7 becuz i don't have enough memoryy. Someone help… I tried following apple.com help steps and nothing worked… Can't restore cuz I don't have a place to bak up everything… What do I do

Can you be more specific please?

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