How to extend the validity period of mobile phone cards in Shanghai

Recently, the validity period of the mobile phone card is approaching, but there is still nearly 40 yuan in it, and I do not call very much (200 for long-distance use), so it saves the mobile phone fee; then I am running a package, every month, I will return 16 yuan in the middle of the card, which is basically enough, so that I don't have to recharge.

What should I do?

I found it online just now and can extend the validity period (3 months). It seems that mobile is still quite good !......

The specific method is as follows:

Send "ycyxq" to 10086. (Ycyxq: extend the validity period)

OK, it's that simple, but only once a year. Actually, this is enough for me ......

I just tried it and I replied immediately after moving it. Haha, it actually works. Now the mobile phone card is valid until March August. Khan ......