Nokia 920 Not Recieving Texts From One Person?

I started talking with someone one day and we noticed i never received some of their texts. This problem only occurs with this one person. I use an unlocked Nokia 920 with a t-mobile sim card on straight talk, the other person use an iphone on At&t. Why is this happening and how do I fix it?

Omfg the same thing happens to me, I have the same phone. And the problem is the phone its really glitchy and there's no way of fixing it! Does your phone sometimes shut off for no reason or when you drop it, even if its not even that hard, does the phone turn off? That's happens to me like everyday!

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