Why can't T-mobile users recieve or send textings to ipod touch?

Blah Blah Blah

New member
My friend has an ipod touch and I'm a T-mobile pre-paid holder
We used be able to text back and forth.
But I couldn't recieve some of his textings and he couldn't recieve most of mine either (recently).
I was still charged for the text messages although he can't even recieve it.
My friend can text to anyone but me and his other friend who is also a T-Mobile user.
Anyone know why that is happenning.
 
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