There are too many reminder services available these days, but users prefer those with rich features and free ones.
Here is this popular web site rememberthemilk.com which is giving reminder alerts services.
Important tasks which you do not want to miss or birthdays to remember, all rememberthemilk.com remembers for you. You can get those reminders notifications on your chat messengers as chat message, as email alert and as SMS notifications with your Ufone and Zong numbers.
You can share your tasks with friends, add tasks from iGoogle or synchronize them with Google Calendar.
It is easy to setup your Ufone with rememberthemilk.com, after registration, login and go to Settings and then Reminders tab, From there select Mobile from “I want to be reminded by”, then country Pakistan and Ufone You can write your ufone number in local or international format with 923331234567.
For Zong customers this service is totally free, currently they have not added Zong to their supported mobile networks list. I have sent them email and they said will add Zong in coming days in supported networks list. But do not worry; still Zong customers can use rememberthemilk.com using the email to sms method. Simply go to Settings, in “I want to be reminded by” select email and next to it write your zong email to sms id (for example [email protected])