Siyag/What is a kosher smartphone?

The term is used loosely, which is part of why the choice is confusing. Some people mean a phone with no internet at all. Some mean a phone with a filtered internet connection. Some mean a normal phone that has been locked down after the fact. All three get called "kosher phones" in conversation, and they solve genuinely different problems.

Below is what each approach actually does, what it costs you in convenience, and where it tends to fail. We build one of these four things, and we have tried to describe the other three fairly rather than conveniently.

1. Kosher flip phones and feature phones

A basic handset that makes calls and sends texts and has no app platform to lock down in the first place. Nothing to bypass, because there is nothing there.

Trade-off: you give up everything a smartphone is for — navigation, banking, work email, photos, WhatsApp for family and school groups. For many people this is the right answer and the simplicity is the entire point. For anyone who needs a specific work or logistics app, it is a non-starter.

2. Pre-filtered smartphones from a kosher phone retailer

You buy the device from a vendor who configures it before shipping — typically removing the browser, the app store and social apps, and installing a filtering service. The phone arrives ready to use.

Trade-off: convenience, at the cost of buying new hardware and being tied to that vendor's configuration and support. If you already own a perfectly good phone, you are replacing hardware to solve a software problem. Changing what is blocked later usually means going back to the vendor.

3. Filtering services (VPN or proxy based)

A subscription service routes the phone's internet traffic through the provider's infrastructure, where web content is inspected and inappropriate pages and images are blocked. This is what most people mean when they say "a filter" — it filters the content of the internet rather than access to the apps.

Trade-off: it is the only approach in this list that can filter web pages, which is a real advantage if you want a working but filtered browser. The costs are an ongoing subscription, all of your traffic passing through a third party, dependence on that connection, and — in many implementations — a filter that a determined user can disable if they can reach the phone's settings.

4. Device-level lockdown (what Siyag does)

The phone you already own is provisioned as a managed device, the same way companies lock down corporate phones. Instead of filtering the internet, this approach removes access to the apps that reach it — every browser, the Play Store, social media, AI assistants — and puts that configuration behind a PIN that the user of the phone does not hold.

The reason to choose this approach is durability rather than coverage. Because it uses Android's Device Owner permission, the app cannot be uninstalled or switched off through Settings without the PIN — which is the specific failure most people have already experienced with ordinary filtering apps and built-in parental controls.

The four approaches side by side

For a neutral, non-commercial overview of the filtering services available in the community, Tech Kosher maintains a directory that is not run by any single vendor.

What about AI?

This is the newest gap, and it is the reason many people who already had a filter are looking again. AI assistants are no longer only standalone apps you can decline to install — they are built into apps that are already on the phone and already approved. Gemini inside Google Messages. Meta AI inside WhatsApp, Instagram and Messenger. My AI inside Snapchat.

A filter that works at the network layer often does not see these as separate destinations, and an app blocker that works at the app layer cannot block WhatsApp's AI without blocking WhatsApp itself. Siyag detects those assistants on the device and blocks the assistant while the rest of the app keeps working. That is written up separately in blocking AI apps and assistants on Android.

Which one should you pick?

• You want no smartphone at all — a flip phone. Nothing else is simpler.
• You want a filtered browser that still works — a filtering service. Siyag will not do this.
• You want someone else to set it all up on new hardware — a pre-filtered device from a retailer.
• You already own the phone, want to keep specific apps working, and have been burned by a filter that got switched off — device-level lockdown.

These are not mutually exclusive. A filtering service and a device lockdown solve different halves of the problem, and some people run both.