I am having a difficult time finding a solution to my issue: I have 2 separate SIM cards, one is AT&T and the other is T-Mobile. When I travel overseas, I put the T-Mobile SIM card in, as I get unlimited data and texts. I forward my AT&T number to my T-Mobile number, but I am unable to forward my texts. I was told I could forward my texts by upgrading to Yosemite, but all that has is allow me to forward the CURRENT SIM card phone I am using to my computer, which is great, but I STILL am unable to to forward my AT&T texts. It seems that once I remove the SIM card, it takes my AT&T number off the system. So my question is this: Is there any way, any App, that allows me to forward my texts from one number to another?