Exceeding your plan's limits and ending up with a larger bill than you signed up for is always an unwelcome surprise.
1) Choose a plan which is most in line with your personal needs
. That way you make sure that on a regular basis you will not end up paying extra and if at all it won’t be much.
2) Check your usage regularly. Along with your postpaid plan, you can set up a user account. Their you can your usage in real-time and see how you are fairing with your plan. Usually, you will be noticed shortly before you reach a certain service’s limit. This reminder should be taken seriously.
3) Be aware of your limits! Not having to load your balance and get promos may give you the feeling of having unlimited access. This, of course, is not true, and excess usage can lead to shocking extra fees.