The courier showed that it had been signed, but I didn't receive it and didn't send me a text message. What happened?

There are several possibilities for this situation.

1/ agent sign for receipt, for example, express delivery usually goes to the county seat and you happen to have an agent in your village. When he receives it, he will inform you that there will be a one-day time difference between this meeting and the express logistics inquiry.

2\ Special items, such as clothes, will be signed for if the outer packaging is not damaged.

3/ Maybe your mobile phone has the function of blocking short messages, such as housekeeper or something.

3/ It may be that the courier is being distributed.

Finally, anyway, it's best to call the courier first.