- Data
- 2GB/28 days
- Calls
- Unlimited
- Type
- Prepay
$18.47/moPaid as $17 every 28 days
View deal14 plans compared
Mobile plans under $20 a month
Great for light users, kids and backup phones. These plans all cost under $20 a month, based on the monthly equivalent price.
Prices checked 12 October 2026
At a glance
We list 14 plans here from 8 providers. The typical (median) plan costs $15.50 a month. That's lower than the $43.45 typical price across all plans. 12 are prepay and 2 are pay monthly. The Spark network has the most (5), then 2degrees (5) and One NZ (4).
- 14Plans
- 8Providers
- $8–$19Price range
- $15.50/moTypical price
- $15.20Typical cost per GB
Top picks
Contact Energy mobile
9.2/10Extra Small (2GB Carryover)
- Data
- 2GB/mo
- Calls
- 200 mins
- Type
- Pay monthly
$16/moPaid monthly
View deal
Kogan Mobile
7.7/10Standard Monthly Prepay
- Data
- 2GB/mo
- Calls
- Unlimited
- Type
- Prepay
$17/moPaid monthly
View dealAll under $20 compared
Data
Budget per month
Providers
Showing 14 of 14 plans
| Plan | Calls | ? | ? | Actions | |
|---|---|---|---|---|---|
| 2GB/28 daysRollover | Unlimited | $18.47/moPaid as $17 every 28 days | 9.5/10 | View deal | |
Contact Energy mobileExtra Small (2GB Carryover) | 2GB/moRollover | 200 mins | $16/moPaid monthly | 9.2/10 | View deal |
Kogan MobileStandard Monthly Prepay | 2GB/mo | Unlimited | $17/moPaid monthly | 7.7/10 | View deal |
Warehouse Mobile$15 Combo | 1.25GB/28 daysRollover | 200 mins | $16.29/moPaid as $15 every 28 days | 8.0/10 | View deal |
Mercury Mobile1.25GB Rollover Data | 1.25GB/moRollover | 250 mins | $19/moPaid monthly | 6.2/10 | View deal |
| 1GB/28 daysRollover | Unlimited | $14.12/moPaid as $13 every 28 days | 9.5/10 | View deal | |
2degrees$15 Monthly Plan (Prepay) | 1GB/moRollover | Unlimited | $15/moPaid monthly | 9.4/10 | View deal |
One NZRollover Small | 1GB/moRollover | Unlimited | $18/moPaid monthly | 7.3/10 | View deal |
Spark$18 Value Pack | 1GB/moRollover | 100 mins | $18/moPaid monthly | 6.5/10 | View deal |
Warehouse Mobile$9 Combo | 300MB/28 daysRollover | 100 mins | $9.78/moPaid as $9 every 28 days | 8.2/10 | View deal |
Skinny$8 Plan (250MB Data) | 250MB/28 days | 100 mins | $8.69/moPaid as $8 every 28 days | 8.0/10 | View deal |
One NZStarter Prepay | 250MB/mo | 100 mins | $10/moPaid monthly | 7.0/10 | View deal |
2degrees$8 Monthly Plan (Prepay) | 150MB/moRollover | 100 mins | $8/moPaid monthly | 9.2/10 | View deal |
Warehouse Mobile$10 First Phone Combo | No data | Unlimited | $10.86/moPaid as $10 every 28 days | 4.7/10 | View deal |
Frequently asked questions
What is the best mobile plan under $20 in NZ?
Sorted by data, the top plan under $20 is Skinny $17 Plan (2GB Rollover Data) with 2GB/28 days for $18.47 a month.