Multilogin Mobile Proxy Setup: Coronium 4G/5G Integration Guide
Mimic and Stealthfox proxy setup with Coronium dedicated 4G/5G ports - built-in metered proxy traffic vs your own unlimited port, and how to scale from Free to Business.
Multilogin is a cloud phone platform that also ships browser profiles on two engines (Mimic Chromium + Stealthfox Firefox) with bundled proxy traffic and full custom-proxy support. This guide covers the Coronium custom-proxy setup for browser profiles, the economics of Multilogin's metered proxy traffic vs a dedicated Coronium port, scaling from Free to Business, and bulk API onboarding for agencies. Plan limits re-verified against multilogin.com/pricing on 2026-09-23.
TL;DR - Setup in 60 seconds
Multilogin profile (Mimic or Stealthfox) โ Proxy tab โ "Custom proxy" โ SOCKS5 โ paste Coronium host:port + login:password โ Test proxy โ Save. Use a Coronium port for production workloads (unlimited traffic, dedicated IP); use Multilogin's bundled proxy traffic for light testing. For 25+ profile agencies, Multilogin API + Coronium reseller REST API is the bulk-onboarding combo.
On this page
Built-in proxy traffic vs your own Coronium port - economics
Multilogin bundles premium proxy traffic with every plan, metered in GB: 200 MB one-time on Free, 1 / 2 / 3 GB per month on Pro 10 / 20 / 50, and 5 GB per month on Business 100. A Coronium port is a dedicated 4G/5G IP with unlimited traffic at a flat monthly price. (Multilogin's "mobile minutes" are something else: runtime for its cloud phones, not proxy time.)
| Workload pattern | Multilogin bundled proxy traffic | Coronium your-own-port |
|---|---|---|
| One-shot account registration | Covered by bundled traffic | Overkill - bundled traffic wins |
| Light daily logins, text-only pages | Usually fits 1-3 GB/month | Worth it when you want one dedicated IP per account group |
| Media-heavy work (video, Reels, TikTok feeds) | Burns through GB allowance fast | $97-$149/mo flat, unlimited traffic |
| 24/7 automation or scraping | Metered traffic runs out | $97-$149/mo flat, unlimited (the practical option) |
| Multi-account agency, 25+ profiles | Shared metered pool across the team | Volume discount: 10% at 10+ lines, 15% at 25+ |
Rule of thumb: if a profile loads images or video all day, bundled GB traffic will not last the month. Bundled traffic fits quick testing, account registration and occasional logins. Production workloads almost always belong on a dedicated Coronium port.
6-step setup walkthrough
- 1
Buy a Coronium mobile proxy port
Pick country + tier. Dashboard exposes host, port, login, password.
- 2
Pre-flight test with curl
curl -x socks5h://user:pass@host:port https://api.ipify.org should return a mobile-carrier IP for your country.
- 3
Open Multilogin โ New Profile
Pick Mimic (Chromium, default for most workloads) or Stealthfox (Firefox, fallback for Chromium-fingerprinted sites). Set OS + fingerprint defaults.
- 4
Proxy tab โ Custom proxy
Switch from Multilogin built-in proxy to "Custom proxy". Pick SOCKS5 protocol.
- 5
Paste Coronium credentials โ Test proxy
Paste host, port, login, password. Click "Test proxy". Multilogin returns egress IP - confirm it matches purchased country and shows mobile carrier ASN.
- 6
Save โ launch โ verify
Save profile. Launch browser (Mimic or Stealthfox). Visit whatismyipaddress.com (IP check) then browserleaks.com (fingerprint check). Both should be consistent.
Mimic vs Stealthfox - which engine for what workload
Mimic (Chromium-based)
- โขDefault for ~90% of workloads.
- โขFacebook, Instagram, TikTok, Twitter, Google, YouTube - all expect Chromium-style fingerprints.
- โขBest Chromium-extension compatibility.
- โขLarger market share = harder for sites to single out.
Stealthfox (Firefox-based)
- โขFallback for Chromium-fingerprinted sites.
- โขSome banking, KYC, niche e-commerce specifically detect Chromium.
- โขFirefox audience smaller - more identifiable as "Firefox user".
- โขCoronium proxy works identically - engine choice doesn't affect proxy config.
Pick Mimic by default. Switch to Stealthfox only if you have a confirmed-detection issue with Chromium on your target site.
Common errors & fixes
| Error | Fix |
|---|---|
| "Test proxy failed" | Match SOCKS5/HTTP to port type. Verify credentials. Test with curl first. |
| "Profile cannot launch" | Check the Multilogin desktop app is running. On the Free plan you are capped at 5 profiles - archive one or move to Pro 10. |
| "Network error" mid-session | Mobile carrier signal drop or scheduled rotation. Disable Coronium scheduled rotation for Multilogin profiles. |
| Egress IP shows datacenter | Profile bypassing proxy. Check Proxy tab is "Custom proxy" not "Direct". |
| DNS leak | Use SOCKS5 (not SOCKS4) for remote DNS resolution. Verify in Stealthfox about:config that network.proxy.socks_remote_dns is true. |
| Bundled proxy traffic used up | The profile is on Multilogin built-in proxy traffic, not Coronium. Switch to "Custom proxy" with Coronium credentials (unlimited traffic). |
| Slow Stealthfox launch | Firefox engine is heavier than Chromium. Pre-warm by launching one Stealthfox profile manually before bulk operations. |
Scaling Multilogin ร Coronium for 25+ profile agencies
Bulk-onboarding pattern
- Coronium reseller REST API:
POST /v3/ports- allocate N ports for a country. - Coronium API:
GET /v3/ports- list credentials in JSON. - Multilogin API (all Pro and Business plans; custom rate limits on Business):
POST /profiles- create N profiles, embed Coronium credentials in proxy field. - Multilogin API:
POST /profile/start- launch profiles individually or in batch.
Two-API pipeline takes ~50 LOC in Python. The Coronium reseller program ships docs for this exact pattern. For agencies running Multilogin Pro 50 or Business (100 to 10,000 profiles), Coronium volume codes (10% at 10+ lines, 15% at 25+, on request from hello@coronium.io) fit the operational shape.
See the full reseller programMultilogin mobile proxy setup - FAQ
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