Should I convert from Post-paid to Pre-paid mobile plan?

Planning for your ideal mobile plan

Many retirees "inherited" the obsolete mobile phones from their children when they upgrade the phones. Since a mobile plan (with a SIM card) is needed to make the old phone come alive, they leave the decision of their mobile plans to their children. Most of their children chose post-paid plan with limited incoming voice calls with no data plan. However, most old folks are wary of making outgoing voice calls because they are not used to the phone and it is chargeable. For some old plans, they are paying more than S$60+ for 300 min outgoing minutes per month. Due to fierce competition over the years, new plans are more competitive at S$25+ for 100 min outgoing. However, many are ignorance of this option when their contract is due. The same applies for students in schools, polytechnics and universities, except their phones are normally smart phones with data plan.
The demand of pre-paid mobile plan is attractive to short-term tourists and our foreign "talents" (aka workers) who rarely use their phone and cannot get credit. The beauty of pre-paid plan lies in the absence of 2-year contract with the telco. This target segment is not demanding of voice mail, text or data plan since their phones are either low-end or obsolete models. So they are compromised to pay a higher price to use pre-paid services.
Stop, read paragraph 2 again. If you believe every word I wrote, then perhaps you need a paradigm shift. Ten years ago, paragraph 2 is politically correct but it is no longer true now. If 50% of Europe is using pre-paid plans, you are a true believer on the myths of using pre-paid plan. Let me tell you why.

Post-paid vs Pre-paid

If a picture paints a thousand words, I hope this table shed lights on the differences.

	Post-Paid	Pre-Paid
Payment mode	After use	Before use
Monthly Bills	Yes	No
Subscription	Yes	No
Contract binding	2 years	None
Free phone bundle	Yes	None
Registration Charge	S$10.70	None
Free incoming voice calls	Yes	Depending on the plans
Free SMS	Yes	Depending on the plans
Free Caller ID	No	Yes
Free Voice Mail	No	Yes
Fee incoming calls	Yes	Depends

 
Yes. That's all for the differences. How about data plan, IDD calls, international roaming? Don't worry. Pre-paid plans cover them and sometimes offer more.
If you are using post-paid, there is no such thing as free outgoing voice call. It has been factored into your month free minutes. That's why you are paying more for 300 or 700 minutes. It is charged at SS$0.16/min if you exceed your allocated free minutes. Many customer service representatives will tell you to choose the highest minutes plan from your maximum usage. So you are choosing 100min/mth plan (S$16 value) if you are using 80min/mth and 300min/mth plan (S$54 value) when you are in fact using 101 min/mth.
Basically, prepaid plan is not restricted by the number of outgoing voice call minutes and number of SMSs. The catch is pay-as-you-use and in fact, more flexible than standard post-paid services. Therefore, get ready for the surprise if you are the frog still hiding in the well.

Pre-paid plans in the market

Being the largest mobile player in Singapore, SingTel has 4 different pre-paid offerings:

• Hi!card (standard prepaid at 8 cents/min during Happy Hour) with top-up options of (15% bonus, S$28, S$30 and S$55)

• Kababayan Card (calling Philippines at 7 cents/min )
• simPATI kangen Card (calling Indonesia at 16-26 cents/min)
• Sawadee Card (calling Thailand at 6 cents/min)

Since we are targeting at Singaporeans who are interested to convert from Post-paid to Pre-paid, cards and top-up options which are targeting for foreigners who wish to make IDD calls will be omitted in our discussion. Hence, we only consider the Hi!card and its top-up options.
Starhub has 2 basic plans – Green (Happy S$128 and Happy Star S$17) and MaxMobile for voice and data plan respectively. Top-up options are Happy (voice) and Happy Stars (data) prepaid. On and off, they introduce some perks to make their pre-paid cards more attractive. Since we are focusing only on voice plan, we shall take MaxMobile out of the equation.
M1 also has 2 pre-paid plans – M Super S$130 and SuperPac. The former targets standard users while SuperPac targets foreigners who live in a different time zone. We shall consider both plans with its top-up options.

Benchmark using a Post-paid plan

For low usage users, we need a benchmark for comparison so we take a standard 100min/mth plan with no data plan at a comparable value of S$25.68 (100 outgoing minutes and 500 SMSs). Over a period of 24 mths, a post-paid plan will cost a subscriber a total of S$616.32. Note that Post-paid plan can receive unlimited incoming call.

	100min/mth	300min/mth
Free outgoing voice minutes	100	300
Free SMS	500	500
Cost for 1 month (S$)	25.68	48.15
Costs over 24 mths (S$)	616.32	1155.60

 

Case studies

For the Pre-paid plan, let make the following presumption for both groups of consumers:

	Old folk	Night shift worker	Businessman
Duration of incoming calls a month (min)	50	75	150
Duration of outgoing calls a month (min)	50	75	100
Average call duration (min)	1	2	3
Calls made during peak period	80%	10%	60%
Calls made during non-peak period	20%	90%	40%
SMS per month	0	500	600

 
A run through the formula reveals the following:

Best plan	Old folks	Monthly bills (S$)		Night shift worker	Monthly bills (S$)		Businessman	Monthly bills (S$)
1	Singtel Hi!Card (S$55)	9.71		Singtel Hi!Card (S$28)	15.96		Singtel Hi!Card (S$28)	32.63
2	Starhub Green	12.75		Starhub Happy Star card (S$17)	18.46		M Card Super S$130	38.75
3	Singtel Hi!Card (15% bonus)	13.25		Hi!Card (S$55)	19.71		Starhub Happy (S$128)	41.58
Post-paid Plan	Standard 100 min/mth	25.68		Standard 300min/mth	48.15		Standard 300min/mth	48.15

 
The results may be surprising for many because 100min/mth plan can be cheaper than S$10/mth. Yes, it happens. By seizing advantages of the off-period period, you are able to make cheap calls thereby reducing the costs of mobile ownership. Either case, we see most pre-paid plans are cheaper than standard post-paid plans if you ignore the free incoming calls. Bear in mind that pre-paid plans are pay-as-you-use so if you have low usage for that month, you can effectively save more. It is a wonderful way of limiting your phone bill.
An excellent example is a night shift worker. Since there is no 200min/mth plan and outgoing voice at 150min/mth, one need to take up the 300min/mth plan as "adviced" by experts. If he/she takes up a pre-paid plan, savings is sizable and even better than a 100min/mth plan. The saving is nearly half of what he is paying for 300min/mth plan. Can you see the beauty?
Even for a businessman with 300min outgoing voice calls, the bill is much cheaper than a standard 300min/mth plan. Yes, it is possible and you can do your own maths.

The balance of the equation

If pre-paid plans are superior in value, why most of us still signing up post-paid plans? The answers are simple. In the beginning, many have no phone and signing a 2-year contract can get a free or discounted phone. Also, we are haunted by the old Pre-paid plans which are unattractive in value as compared to post-paid plans. It may costs twice as much to call out as compared to post-paid plans.
Now, new pre-paid plans are customized for the new market segments to suit the trend. In Europe and USA, pre-paid plans are bundled with phones and some are having free incoming calls (like M1 SuperPac). These pre-paid plans are very attractive as it offers customers good benefits without a contract to tie them down. If they are near to the end of their contract and the phone is working fine, a new pre-paid plan with free incoming call may offer more values to them.
An interesting find is the M1 SuperPac and Starhub Happy Star. They offer data plan and 24-hours free incoming calls so they are in-between pre-paid and post-paid plans. If you really compare the details, they are catered for travellers and adults who are working 9-6pm who cannot answer mobile during this period (ie. Hotel service staffs).
Last but not least, it is important to consider the validity of the card since its last top up. It will make a difference on what is the frequency of top-up. It is crucial if you seldom use the phone. So, how about getting a pre-paid card now?