🌐 Mobile Proxy Guide

Complete technical documentation for setting up and managing your RelayKit mobile proxies — connection methods, location switching, IP rotation, and troubleshooting.

Overview

RelayKit mobile proxies route your traffic through real 4G/5G smartphones on US carrier networks. Each proxy license is 100% dedicated — one modem, one customer, never shared. You get a real mobile IP address identical to those used by millions of everyday users, giving you the highest trust scores with any platform.

Proxies are available on three US carriers — AT&T, T-Mobile, and Verizon — across 50+ US cities. All plans support HTTP and SOCKS5 protocols, IP whitelisting, manual IP reset, and TCP fingerprint spoofing.

Plan Types & Carriers

RelayKit sources proxies from two provider networks. The plan type shown at checkout depends on which carrier and city you select. From a setup and usage standpoint they work identically — same ports, same dashboard controls, same features.

AT&T, T-Mobile & Verizon — Flexible Billing Plans

Proxies on AT&T, T-Mobile, and Verizon are available in short-term billing cycles with both 4G and 5G modem tiers:

4G — Solid, consistent speeds. Great for most use cases.
5G — Higher throughput where available.

Billing periods: Day, Week, Month. These proxies support location changes (within the same 4G or 5G tier) and are available in select major US metros including New York, Houston, Chicago, and more.

Verizon — Multi & Single Location Plans (Monthly)

Verizon is also available on longer monthly subscription terms with two location plan types:

Multi Location — Access any of 50+ US cities. Switch locations freely, unlimited times.
Single Location — Lock to one city for your subscription period. More affordable when you need a fixed location. Includes up to 2 location changes.

💡 Not sure which to pick? AT&T/T-Mobile plans are great for short projects or testing. Verizon monthly plans are better value for ongoing, long-term use.

Getting Your Credentials

After purchasing a proxy plan, your credentials are available in your dashboard immediately.

Click your proxy license to open the detail view.

Verizon plans only: if you haven't connected to a location yet, select one from the locations list and click Connect. AT&T and T-Mobile proxies are pre-assigned to a city at purchase.

Click the HTTP / SOCKS5 Proxy tab to view your connection details.

Your credentials will look like this:

Your proxy credentials
HTTP Proxy IP: your-proxy-ip
HTTP Port:     8000
SOCKS5 IP:     your-proxy-ip
SOCKS5 Port:   9000
Username:      your-username
Password:      your-password

💡 Tip: You can skip the username/password requirement entirely by enabling IP Whitelisting — see the IP Whitelisting section below.

HTTP vs SOCKS5 — Which Should I Use?

Both protocols send your traffic through the same mobile proxy. The difference is how they handle it:

HTTP (port 8000) — Works with most browsers and apps natively. Supports HTTPS traffic too (just check "Also use for HTTPS" when configuring). Easier to set up in most browsers.
SOCKS5 (port 9000) — Lower-level protocol that handles any type of traffic, not just web. Better for applications that support it, antidetect browsers, and tools that need full traffic routing.

If you're just using a web browser, HTTP is the simplest option. For antidetect browsers, automation tools, or mobile apps, SOCKS5 is generally preferred.

HTTP Proxy — Firefox Setup

Open Firefox. Click the menu button (≡) in the top-right corner and select Settings.

Scroll to the bottom of the page and find Network Settings. Click the Settings… button.

In the Connection Settings dialog, select Manual proxy configuration.

In the HTTP Proxy field, enter your proxy IP address. Set the port to 8000. Check the box labeled "Also use this proxy for HTTPS".

Click OK to save.

Open a new tab. A pop-up will appear asking for your username and password. Enter the credentials from your dashboard and click Sign In. You're connected.

💡 To avoid entering credentials every time, set up IP Whitelisting instead.

HTTP / SOCKS5 — FoxyProxy Browser Extension

FoxyProxy is a browser extension that lets you manage multiple proxy configurations easily, and quickly switch between them. It works with both HTTP and SOCKS5. We recommend using it with Firefox for the best compatibility.

Installation

Install the FoxyProxy Standard extension from your browser's extension store (search "FoxyProxy Standard").

Adding Your Proxy

Click the FoxyProxy extension icon in your toolbar and select Options.

Go to the Proxies tab and click Add.

Set the Type to either HTTP or SOCKS5 depending on which protocol you want to use.

Enter your proxy credentials from the dashboard:

IP address (from the HTTP or SOCKS5 field)
Port: 8000 for HTTP, 9000 for SOCKS5
Username and password

Click Save.

Click the FoxyProxy icon and select the proxy you just saved to activate it.

FoxyProxy can store multiple proxies — great if you're managing multiple RelayKit licenses across different locations. Just repeat steps 2–5 for each one.

SOCKS5 — Android (SocksDroid)

To route your Android device's traffic through your proxy, use the SocksDroid app (free on Google Play).

Install SocksDroid from the Google Play Store.

Open the app. In the Server IP field, enter the SOCKS5 Proxy IP from your dashboard.

Set the Server Port to 9000.

Enable Username & Password Authentication. Enter your proxy username and password.

Toggle the button at the top of the app to activate the connection.

Changing Locations

Location switching works slightly differently depending on which carrier your proxy is on.

AT&T & T-Mobile Plans

Click your proxy card in the dashboard and use the Change Location button. You can move to any available city within the same modem tier (4G plans stay on 4G, 5G on 5G). The change takes a few seconds while the modem connects to the new location and your new credentials are assigned.

💡 After a location change, your proxy IP and credentials may update. Refresh your proxy card in the dashboard to see the new values.

Verizon Multi Location Plans

Unlimited location changes are included. From your proxy license page, scroll to the locations list and click Connect next to any available city. The switch is instant.

If you see "Location Full — Try Again Later", that city's modems are at capacity. Wait a few minutes and try again, or choose a different city.

Verizon Single Location Plans

Single Location plans include 2 location changes. After using both changes, the proxy locks to that city for the remainder of your subscription. Choose your location carefully.

IP Reset

Every RelayKit proxy supports manual IP resets. An IP reset gives you a fresh mobile IP address from the carrier network — the process takes 4–10 seconds.

From your proxy license page in the dashboard, click the Reset IP button. Your outbound IP will change within seconds. Use this whenever you need a clean slate.

IP Whitelisting

IP Whitelisting lets you connect to your proxy without a username or password. Instead, your public IP address is pre-authorized — any connection from that IP is automatically authenticated.

This is useful when your public IP is stable (like an office network or a server with a fixed IP), and you want to avoid entering credentials in every application.

From your proxy license page, click the HTTP / SOCKS5 Proxy tab.

Click Enable IP Whitelist.

Click Set IP Whitelist and enter your public IP in CIDR notation. For a single IP address, add /32 at the end — for example:

48.154.30.5/32

To find your public IP, visit whoer.net.

⚠️ IP Whitelisting and username/password authentication are mutually exclusive. When whitelisting is enabled, credentials are not required or accepted.

TCP Fingerprint Spoofing

TCP Fingerprint Spoofing makes your connection appear to originate from a specific operating system at the network level — independently of your browser's user agent.

Available OS profiles:

Default — No spoofing, uses the modem's native fingerprint
Windows — Mimics a Windows PC
macOS / iOS — Mimics Apple hardware
Linux / Android — Mimics Linux or Android devices

To get the best results, match your browser's user agent to the OS you've selected for spoofing. For example, if you set spoofing to Windows, make sure your browser reports a Windows user agent.

💡 TCP Fingerprint Spoofing is included on all plans and can be changed anytime from your proxy controls in the dashboard. Enabling it may slightly reduce download speeds.

Troubleshooting

Proxy isn't connecting

Double-check you've copied the IP, port, username, and password exactly — no extra spaces.
Make sure you're using the right port: 8000 for HTTP, 9000 for SOCKS5.
Confirm your proxy license is active and not expired in the dashboard.
Verizon plans: confirm you've selected a location and clicked Connect — credentials won't appear until a location is selected.
AT&T / T-Mobile plans: credentials are assigned at purchase and shown immediately in the dashboard. If the IP field is blank, open the proxy card and wait a moment for credentials to load.

Connection is slow

Try an IP Reset from the dashboard — this gets you a fresh address on the carrier network.
Try switching to a different city using the Change Location option.
If you have TCP Fingerprint Spoofing enabled, try disabling it temporarily — it can reduce speeds slightly.
On AT&T/T-Mobile 5G plans, speeds may vary by city and time of day — try a different city if one feels slow.

Platform is blocking my proxy

Try resetting your IP — you may have been assigned an IP that was previously flagged by that platform.
Make sure you don't have a conflicting VPN running alongside the proxy.
Try switching carriers — if your AT&T IP is flagged, try a T-Mobile or Verizon city for a different IP pool.
Some platforms detect and block proxy traffic regardless of IP type. Switching to a different location can help.

Still not working?

Email support@relaykit.net with your proxy reference number and a description of the issue. We'll diagnose it with you.