Mighty Mobile vs Mercury Mobile
Mighty Mobile wins 2 of 3 usage types on value. Mercury Mobile has the cheaper entry-level plan. Mighty Mobile has the highest-scoring plan for value and features. Mighty Mobile uses the One NZ network and Mercury Mobile uses Spark, so check coverage where you live and work.
Prices checked 12 October 2026
| Feature | Mighty Mobile | Mercury Mobile |
|---|---|---|
| Network | One NZ | Spark |
| Plans listed | 7 | 5 |
| Cheapest plan (per month) | $25.00 | $19.00 |
| Cheapest unlimited | $33.25 | None |
| Best SmartScore | 9.3 | 6.2 |
| Prepay plans | Yes | No |
| Pay monthly plans | No | Yes |
| eSIM | Yes | – |
| 5G | Yes | – |
| WiFi calling | Yes | Yes |
Which should you choose?
Light use
Under 5GB: messaging, maps, a bit of social
- Mighty Mobile
- No plan in this range
- Mercury MobileBetter value
- 1.25GB Rollover Data1.25GB/mo · $19/mo · 6.2/10
Only Mercury Mobile has a plan in this range: 1.25GB Rollover Data (1.25GB/mo, $19/mo).
Everyday use
5GB to 40GB: streaming music, social and some video
- Mighty MobileBetter value
- Starter Plan5GB/mo · $25/mo · 9.3/10
- Mercury Mobile
- 5GB Endless+ Data5GB/mo + endless · $39/mo · 2.6/10
Mighty Mobile's Starter Plan (5GB/mo, $25/mo) costs less than Mercury Mobile's 5GB Endless+ Data (5GB/mo + endless, $39/mo) and scores higher.
Heavy use
40GB+ or unlimited: lots of video, hotspotting
- Mighty MobileBetter value
- Fast PlanUnlimited (10Mbps) · $40/mo · 9.3/10
- Mercury Mobile
- 50GB Endless+ Data50GB/mo + endless · $59/mo · 3.5/10
Mighty Mobile's Fast Plan (Unlimited (10Mbps), $40/mo) costs less than Mercury Mobile's 50GB Endless+ Data (50GB/mo + endless, $59/mo) and scores higher.
Choose Mighty Mobile if…
- You want the better plan for everyday and heavy use
- You want prepay, with no bill or credit check
- You want to pay once for the whole year
- One NZ coverage is better where you live
Choose Mercury Mobile if…
- You want the better plan for light use
- You want the cheapest way in (from $19/mo)
- You prefer a monthly bill
- You want unused data to roll over
- You want data that slows down instead of running out
- Spark coverage is better where you live
Every Mighty Mobile and Mercury Mobile plan
| Plan | Calls | ? | ? | Actions | |
|---|---|---|---|---|---|
Mighty MobileStarter Plan | 5GB/mo | Unlimited | $25/moPaid monthly | 9.3/10 | View deal |
Mighty MobileFast Plan 365 Days | Unlimited (10Mbps) | Unlimited | $33.25/moPaid as $399 once a year | 9.3/10 | View deal |
Mighty MobileFast Plan | Unlimited (10Mbps) | Unlimited | $40/moPaid monthly | 9.3/10 | View deal |
Mighty MobileFaster Plan 365 Days | Unlimited (50Mbps) | Unlimited | $41.58/moPaid as $499 once a year | 9.3/10 | View deal |
Mighty MobileFaster Plan | Unlimited (50Mbps) | Unlimited | $50/moPaid monthly | 9.3/10 | View deal |
Mighty MobileFastest Plan 365 Days | Unlimited | Unlimited | $62.42/moPaid as $749 once a year | 9.3/10 | View deal |
Mighty MobileFastest Plan | Unlimited | Unlimited | $75/moPaid monthly | 8.3/10 | View deal |
Mercury Mobile1.25GB Rollover Data | 1.25GB/moRollover | 250 mins | $19/moPaid monthly | 6.2/10 | View deal |
Mercury Mobile2.5GB Rollover Data | 2.5GB/moRollover | 350 mins | $29/moPaid monthly | 6.0/10 | View deal |
Mercury Mobile50GB Endless+ Data | 50GB/mo + endless | Unlimited | $59/moPaid monthly | 3.5/10 | View deal |
Mercury Mobile5GB Endless+ Data | 5GB/mo + endless | Unlimited | $39/moPaid monthly | 2.6/10 | View deal |
Mercury Mobile150GB Endless+ Data | 150GB/mo + endless | Unlimited | $79/moPaid monthly | 2.2/10 | View deal |
Frequently asked questions
Which is better, Mighty Mobile or Mercury Mobile?
Mighty Mobile wins 2 of 3 usage types on value. Mercury Mobile has the cheaper entry-level plan. Mighty Mobile has the highest-scoring plan for value and features. Mighty Mobile uses the One NZ network and Mercury Mobile uses Spark, so check coverage where you live and work. Light use: Only Mercury Mobile has a plan in this range: 1.25GB Rollover Data (1.25GB/mo, $19/mo). Everyday use: Mighty Mobile's Starter Plan (5GB/mo, $25/mo) costs less than Mercury Mobile's 5GB Endless+ Data (5GB/mo + endless, $39/mo) and scores higher. Heavy use: Mighty Mobile's Fast Plan (Unlimited (10Mbps), $40/mo) costs less than Mercury Mobile's 50GB Endless+ Data (50GB/mo + endless, $59/mo) and scores higher.
Is Mighty Mobile or Mercury Mobile cheaper?
Mighty Mobile’s cheapest plan is Starter Plan (5GB/mo) at $25.00 a month. Mercury Mobile’s cheapest is 1.25GB Rollover Data (1.25GB/mo) at $19.00 a month.
Do Mighty Mobile and Mercury Mobile use the same network?
No. Mighty Mobile uses One NZ and Mercury Mobile uses Spark.
Can I switch from Mighty Mobile to Mercury Mobile and keep my number?
Yes. Sign up with Mercury Mobile and ask to transfer your number. They’ll handle the switch, and you don’t need to cancel with Mighty Mobile first.