Almost any recent iPhone will do
A beta device does not need to be fast, and it does not need a SIM. Anything from the iPhone 11 or iPhone SE (2nd generation) upwards runs this year's release, which means most phones people replaced in the last five years qualify. Our compatibility pages confirm each model.
Storage matters more than speed. A 64 GB phone will struggle to hold a beta plus its install cache, so a 128 GB device is a much less frustrating starting point even if it is a generation older.
Set it up clean, not from a backup
Restoring your main phone's backup onto the test device defeats half the purpose: it doubles the indexing work, fills the storage, and puts your full data set on a device running unfinished software. Set it up as a new iPhone instead.
Sign in to iCloud so Messages, Photos and the apps you actually want to test are available, and install only the apps you intend to try. A deliberately sparse test device produces clearer results, because a problem is far easier to attribute when there are ten apps installed rather than a hundred.
Connectivity without a second plan
Wi-Fi covers most testing. For anything that needs mobile data, your main phone's Personal Hotspot works, and an eSIM data plan is inexpensive if you want the device to be genuinely independent.
Do not move your primary SIM back and forth. Beyond the inconvenience, the beta device is exactly where you do not want your phone number to live if a build breaks calls or messages.
Which channel to put it on
This is the one situation where the developer channel makes sense. A device with nothing depending on it can absorb beta 1, and the earlier builds are where the useful bug reports come from. Both channels are free — see our explainer.
Keep your main phone on the shipping release, or on the public beta once it has settled. That combination gives you the new features to try and a working phone to depend on, which is the entire point of the arrangement.
What this arrangement buys you
You get to answer the question everyone asks — does this beta break the apps I use — before it matters. You can install the RC on your main phone in September knowing exactly what to expect, and you can file useful bug reports rather than hoping someone else does.
It also removes the one genuine risk in beta testing entirely. There is no downgrade to perform, no backup to restore and no bad week to sit through, because nothing you depend on is running the beta. Our main-device guide covers the alternative.
Frequently Asked Questions
Which old iPhones can be used as beta test devices?
Anything on this year's compatibility list — iPhone 11 and iPhone SE (2nd generation) upwards. Storage matters more than speed; 128 GB is far more comfortable than 64 GB.
Should I restore my backup onto the test device?
No. Set it up as a new iPhone and install only what you want to test. A sparse device makes problems much easier to attribute.
Do I need a SIM in the beta device?
No. Wi-Fi covers most testing, and Personal Hotspot from your main phone covers the rest. Do not move your primary SIM into a beta device.
Which beta channel should the test device be on?
The developer channel. It is free, and a device nothing depends on is exactly where the earliest builds belong.