I got similar issue here, transferred the number 4 days ago, works fine first day or two. But now all the text/SMS are sent back to the old SIM and I just realize after I put the old SIM to one of my phone.
I activate my card 4days ago and now you telling me there's a $40 5g plan? Thats not funEdit: Quick update, I asked the customer support and they help me change to this plan, just need to deduct the used data on new plan. Thats awesome