Short answer: past ten phones, the software stops being the constraint and the building takes over: USB power, hub count, heat, network and your time. At 25 you should be running several Macs, not one big one, with a written routine. At 50 you need a dedicated room, a UPS, staged updates, inventory discipline and probably a second person. Grow in steps and fix what breaks at each one.
What we can and can't tell you
Nobody has published controlled data on how many iPhones one Mac can drive, and we won't make one up. Farmero has run four phones at once on one Mac, the largest we've measured. Plan larger farms as several smaller groups, each with its own Mac and hubs, and measure your own limit before relying on it.
What changes at each size
| ~10 phones | ~25 phones | ~50 phones | |
|---|---|---|---|
| Macs | One or two | Several; split into groups | Many; one per group |
| Hubs | One or two powered hubs | One per shelf | One per shelf, spares on hand |
| Power | Power strips | Circuit load matters | Plan circuits; UPS per group |
| Heat | A fan | Fans per shelf | Room cooling |
| Network | Good router, 5 GHz | Access point by the rack | Business-grade network, proxies per phone |
| Signing | Paid developer account | Paid | Paid |
| Updates | Canary phone | Canary + batches | Formal staged policy |
| Tracking | A sheet | A sheet everyone keeps up | A sheet with an owner |
| People | You | You, with a routine | You plus help |
Power and hubs
Each phone charges and works at once, and a hub that can't keep up makes phones brown out and drop off. Size hubs by power per phone and give each hub its own Mac port — see USB hubs. At 25+ phones, add up the adapters on each wall circuit; a tripped breaker is a whole-farm outage. See power outages.
Several Macs, not one
Splitting phones across Macs keeps a single fault — a crashed Mac, a failed hub — from taking out the whole farm. Group phones by Mac, rack and hub, and give each group the same shape so one fix applies to all. A Mac mini is the usual host — see Mac mini as a host.
Heat and space
Twenty-five phones with screens always on make real heat. Open shelving, upright stands and moving air stop being optional. Apple designs iPhones for ambient temperatures up to 35 °C (95 °F) (Apple Support), so measure the room at its warmest.
Process
What breaks at scale is usually the routine, not a device:
- Standard build per phone: same settings, same checklist.
- Staged updates: one canary phone, then batches.
- One inventory sheet that is always current.
- A daily review of failures and uncertain posts.
- A spare phone, hub and cables so a fault is a swap, not a shopping trip.
Costs
The cost of each size, with every assumption listed, is in the phone farm cost breakdown. Remember the costs that grow with size: batteries, cables, proxies, power and your time.
With Farmero
Farmero plans are sized at eight accounts per iPhone and set how many Macs one licence covers:
| Plan | iPhones | Accounts | Macs | Monthly |
|---|---|---|---|---|
| Rack | 8 | 64 | 2 | $99 |
| Studio | 25 | 200 | 5 | $199 |
| Agency | 60 | 480 | 10 | $349 |
Studio covers a 25-phone farm across up to five Macs; Agency covers 50 phones across up to ten. Yearly billing is 25% off except on Agency. See running several phones and pricing. Automating these apps may breach their terms, and nobody can promise an account will never be restricted.
FAQ
How many iPhones can one Mac run?
There is no published controlled figure. Farmero has measured four at once on one Mac. Past a handful, USB power and bandwidth are the limit, so split larger farms across Macs.
What is the hardest part of scaling a phone farm?
Physical reliability: power, cables, heat and keeping records current. The software is rarely the first thing to break.
Do I need more than one person at 50 phones?
Probably. Daily checks, swaps and updates across 50 devices add up. Write the routine down so someone else can run it.
Which Farmero plan fits 50 iPhones?
Agency covers up to 60 iPhones, 480 accounts and ten Macs.