Choosing between a prepaid and postpaid mobile plan in Taiwan can be confusing, especially for newcomers. Both options have distinct advantages depending on your usage patterns, length of stay, and budget. This article provides a detailed comparison of prepaid and postpaid plans in Taiwan, covering costs, data allowances, contract terms, and network quality. Whether you are a short-term visitor, a student, or a long-term resident, understanding the pros and cons will help you make an informed decision.

Overview of Prepaid and Postpaid Plans in Taiwan

Taiwan's telecom market is dominated by three major operators: Chunghwa Telecom, Taiwan Mobile, and Far EasTone. All three offer both prepaid (儲值卡) and postpaid (月租型) plans. Prepaid plans are typically purchased upfront and require top-ups, while postpaid plans involve a monthly contract with a fixed bill at the end of the month. According to the National Communications Commission (NCC), as of 2024, there were approximately 29 million mobile subscribers, with prepaid accounting for about 15% of the market.

Prepaid Plans: Pros and Cons

Pros of Prepaid

  • No contract commitment: Prepaid plans are pay-as-you-go, with no long-term contract. You can stop using the service anytime without penalty.
  • Budget control: You only pay for what you use. This is ideal for light users or those on a tight budget.
  • Easy to get: Prepaid SIM cards are available at convenience stores (7-Eleven, FamilyMart), airport kiosks, and operator stores. You can buy one with just your passport.
  • No credit check: Prepaid does not require a credit check or local ID, making it accessible to tourists and short-term visitors.
  • Flexible top-ups: You can add credit online, at convenience stores, or via apps.

Cons of Prepaid

  • Higher per-unit cost: Data and call rates are generally higher than postpaid. For example, Chunghwa Telecom's prepaid data pack costs NT$1 per 1MB after the initial allowance.
  • Limited data allowances: Prepaid data packs often have smaller allowances. For heavy data users, postpaid is more cost-effective.
  • Shorter validity: Prepaid credit expires after a period (e.g., 180 days). You must top up regularly to keep the number active.
  • No international roaming: Many prepaid plans do not include roaming, or require additional deposits.
  • No phone subsidies: You cannot get a discounted phone with a prepaid plan.

For more details on prepaid options, see our Prepaid SIM Card Taiwan Buying Guide and Best Prepaid Data Plans in Taiwan.

Postpaid Plans: Pros and Cons

Pros of Postpaid

  • Lower per-GB cost: Postpaid plans offer much cheaper data rates. For instance, Far EasTone's 5G 599 plan includes 24GB of data at high speed, costing about NT$25 per GB.
  • Large data allowances: Many postpaid plans offer unlimited data (fair usage policy) or very high caps (100GB+).
  • Phone subsidies: You can get a new smartphone at a discount when signing a long-term contract (24 or 30 months).
  • International roaming: Postpaid plans often include free or low-cost roaming in popular destinations.
  • Add-on services: Postpaid allows bundling with home broadband, streaming services, and family plans.
  • Stable number: No need to worry about credit expiry.

Cons of Postpaid

  • Contract commitment: Most postpaid plans require a 24- or 30-month contract. Early termination fees can be high (NT$3,000–NT$15,000).
  • Credit check required: You need a local ID (ARC) and a credit check. Tourists and short-term visitors cannot easily get postpaid.
  • Monthly bills: You must pay a fixed monthly fee, even if you don't use the service.
  • Overage charges: Exceeding your data cap can result in expensive overage fees (e.g., NT$10 per 1GB throttled).
  • Harder to switch: Changing operators requires paying off the remaining contract.

For a comparison of postpaid plans, read our Best 5G Plans in Taiwan 2025 and Student Mobile Plans in Taiwan.

Cost Comparison: Prepaid vs Postpaid

To illustrate the cost differences, consider a moderate data user consuming 10GB per month. With Chunghwa Telecom's prepaid, you can buy a 30-day 10GB data pack for NT$399. That's NT$39.9 per GB. With a postpaid plan like Taiwan Mobile's 4G 399 plan (12GB at high speed), the cost is NT$33.25 per GB. For heavy users (50GB+), postpaid is significantly cheaper. For example, Far EasTone's 5G 999 plan (100GB) costs NT$9.99 per GB. Prepaid data packs for large volumes are rare and expensive.

Coverage and Speed

Both prepaid and postpaid users get the same network coverage and speed from the same operator. Postpaid users may get priority during network congestion, but in practice, the difference is negligible. Taiwan's 5G coverage is extensive in cities but patchy in rural areas. For a detailed analysis, see our 5G Speed Test Taiwan and 5G vs 4G Taiwan: Which to Choose.

Which One Is Right for You?

Choose Prepaid If:

  • You are a tourist or short-term visitor (less than 6 months).
  • You have a limited budget and want to control spending.
  • You use less than 5GB of data per month.
  • You do not want to sign a contract.
  • You need a temporary number for a specific purpose.

Choose Postpaid If:

  • You are a long-term resident with an ARC.
  • You use more than 10GB of data per month.
  • You want a subsidized smartphone.
  • You need international roaming or family sharing.
  • You prefer a single monthly bill.

For students, there are special postpaid plans with discounts. Check our University Student Plan Comparison.

How to Switch Between Prepaid and Postpaid

If you have a prepaid number and want to switch to postpaid, you can port your number to a postpaid plan at any operator store. You will need your passport/ARC and the prepaid SIM. The process takes about 1-2 business days. Similarly, postpaid users can switch to prepaid after fulfilling contract obligations or paying termination fees.

Additional Tips

Ultimately, the choice between prepaid and postpaid depends on your personal circumstances. For a comprehensive guide, refer to The Complete Guide to Choosing the Best Mobile Plan in Taiwan.

Related articles

  • Prepaid SIM Card Taiwan Buying Guide
  • Best Prepaid Data Plans in Taiwan
  • Best 5G Plans in Taiwan 2025
  • Student Mobile Plans in Taiwan
  • Taiwan Mobile Plan Calculator