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Creating an affordable 4G proxy system from scratch is easier than you think if you're willing to use readily available equipment and smart software choices. The goal is to create a system that can rotate through multiple 4G cellular connections so that each web request appears to come from a different IP address. This is useful for data scraping, multi-profile engagement, or testing location-based services without getting rate-limited.

Begin with sourcing your equipment. You’ll need a batch of affordable mobile routers. Look for models like the TP-Link M7350. These are often sold inexpensively on Facebook Marketplace because people trade in old units. Aim for five to eight devices to start. You’ll also need a a surge-protected extension cord and visit a reliable wired network for your master machine.

Obtain prepaid mobile data cards. Use data-only SIMs from multiple providers if possible. This increases the range of available public IPs. You can buy these online in bulk for as low as $3 per card. Make sure they are pure data plans without SMS allowances to keep costs low. Load each with a light data allowance, which should be enough for moderate web crawling.

Pair every router with an individual data plan and boot it. Configure each router to use a fixed LAN address so your control computer can reliably detect and communicate with them. Most routers have a web interface you can access 192.168.1.1 or similar into a browser. Change the default admin password for security.

Deploy a proxy forwarder on your central machine. TinyProxy is a free open-source proxy server that can be configured to cycle through gateway IPs. Install it on a Raspberry Pi. Configure Squid to route traffic via each LTE gateway. Each router acts as a distinct internet gateway. You’ll need to set up a proxy configuration array for each router in your Squid config file.

To automate IP cycling, use a script that changes the upstream proxy every every 10–15 seconds. You can write a lightweight Python tool using urllib3 and aiohttp to iterate over gateway addresses. Or use a tool like Scrapy-Proxy-Pool to handle the switching. Test the setup by visiting a site like whatismyip.com and verifying the external address updates per query.

Track your SIM data thresholds. Cellular carriers often detect and restrict proxy behavior. If you notice IP blacklisting, increase delays between requests or expand your IP pool. Avoid high-volume requests. Wait at least five to ten seconds between requests to stay under the radar.

Maintenance is simple. Reboot each router once a week to clear memory. If one device stops working, replace it with another. Keep spare SIM cards and routers on hand. You can increase capacity by integrating new LTE modems as your funds permit.

What makes this solution so appealing is its affordability. You can build a five-device farm for under two hundred dollars including everything needed to start. It’s not as enterprise-grade or consistent as commercial services, but it’s 100% under your authority. It’s also a great learning project if you want to understand how proxies, networks, and automation interact.

Always operate within legal boundaries. Don’t violate privacy laws, violate terms of service, or launch DDoS-style attacks. Use your proxy farm for legitimate testing where you hold proper consent. With careful setup, your home-built LTE proxy system can be a powerful and affordable tool.