Choosing a SIM-only plan offers flexibility and value for those who already own a mobile device. In New Zealand, the competition among providers continues to grow in May 2025, delivering more options for data, minutes, and international calling at competitive prices. Whether you’re after unlimited data or budget-friendly monthly rates, New Zealand’s market has a plan for you.
Why Go SIM-Only in 2025?
SIM-only deals remain a top choice for consumers who prioritize cost-efficiency and short-term commitment. With the ongoing rollout of enhanced 5G networks and improving rural coverage, even basic SIM-only plans now offer faster speeds and better reliability. Another advantage is the ability to switch plans more freely as new promotions or improved packages are introduced monthly.
Quick Comparison: Best SIM-Only Plans (June 2025)
| Provider | Plan Name | Data | Price (Monthly) | Contract Term | Special Features |
|---|---|---|---|---|---|
| Spark | Endless Data Starter | Unlimited (Max Speed 40GB) | $79 | No Lock-in | Free Spotify Premium for 6 months |
| One NZ (Vodafone) | MyFlex SIM | 30GB | $55 | 1 Month | 5G Included, Free Rollover Data |
| 2degrees | Pay Monthly 40GB | 40GB | $70 | 12 Months | Unlimited Calls + Texts |
| Skinny | $36 Plan | 12GB | $36 | No Lock-in | Free data binge every Sunday |
| Warehouse Mobile | Combo Value Pack | 15GB | $30 | No Lock-in | Best low-budget option |
Detailed Reviews of Top SIM-Only Plans
Spark Endless Data Starter
Spark’s Endless Data Starter plan in June 2025 remains a crowd favorite. For $79 monthly, users get unlimited data, although speeds may reduce after 40GB. Additional perks like free Spotify Premium for six months and access to Spark’s 5G network make it an attractive pick for music lovers and heavy streamers.
One NZ MyFlex SIM
Formerly known as Vodafone, One NZ offers the MyFlex SIM plan allowing complete customization. You can adjust your data, minutes, and texts via their app anytime. In June 2025, 30GB at $55 stands out, especially with free 5G access and rollover data, ensuring you never lose unused gigabytes.
2degrees Pay Monthly 40GB Plan
For those seeking robust service and larger data packages, 2degrees’ 40GB Pay Monthly plan for $70 offers strong value. Unlimited calls and texts across New Zealand and Australia, plus high-priority 5G network access, make it perfect for heavy users who need consistent performance.
Skinny Mobile $36 Plan
Skinny continues to appeal to the younger crowd and budget-conscious users. Their $36 plan includes 12GB of data and a weekly free data binge feature every Sunday, providing unlimited data for 12 hours. Skinny operates on Spark’s network, ensuring excellent coverage.
Warehouse Mobile Combo Value Pack
Warehouse Mobile stays the leader in affordability. For only $30 a month, users enjoy 15GB of data with no lock-in contracts. While 5G is not yet available on Warehouse Mobile, the reliability and price make it an unbeatable deal for light to moderate users.
Factors to Consider When Choosing a SIM-Only Plan
When selecting the best SIM-only plan, consider factors like network coverage, data rollover policies, speed restrictions after certain data thresholds, and perks such as free streaming subscriptions or international call packages. Also, keep an eye on promotional periods – many providers offer bonuses for the first three to six months.
Best SIM-Only Plans for Different User Types
- Heavy Data Users: Spark Endless Data Starter
- Budget-Conscious: Warehouse Mobile Combo Value Pack
- Flexibility Seekers: One NZ MyFlex SIM
- Frequent Travelers: 2degrees Pay Monthly (includes AU calls)
- Casual Users: Skinny Mobile $36 Plan
Conclusion
June 2025 brings an even broader array of SIM-only options for New Zealanders, catering to every budget and usage pattern. Whether you’re chasing unlimited data, want maximum flexibility, or need the most affordable deal, providers are offering increasingly competitive packages. Make sure to review the terms carefully and take advantage of promotional offers to maximize value.
FAQ
What is a SIM-only plan?
A SIM-only plan provides mobile service without a bundled phone, meaning you pay only for the minutes, texts, and data.
Are SIM-only plans cheaper than traditional phone contracts?
Yes, SIM-only plans are generally more affordable because you aren’t financing a device.
Can I keep my current phone number with a new SIM-only plan?
Absolutely. Most providers in New Zealand allow number porting when you switch.
Do SIM-only plans include 5G access?
Many do, but check the provider’s plan details. Networks like Spark and One NZ include 5G with most plans.
How easy is it to switch SIM-only providers?
It’s very easy. With no lock-in contracts for many plans, you can switch monthly without penalties.
Are there hidden fees in SIM-only plans?
Generally, no, but always read the fine print. Activation fees and add-ons can sometimes increase the overall cost.
What happens if I use all my data in a SIM-only plan?
Some providers slow your speed after the limit is reached, while others allow you to purchase top-ups.
Can I get international roaming with a SIM-only plan?
Yes, though it may require purchasing a roaming pack separately.
Which provider has the best SIM-only customer service?
2degrees and Skinny often receive high marks for customer satisfaction.
Is it better to choose a short-term or long-term SIM-only plan?
Short-term plans offer more flexibility, while long-term contracts can sometimes include discounts or extra perks.
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