LC Phone is the default because it's the path of least resistance. You spin up a sub-account, click a couple buttons, and texts start flowing. No external OAuth, no second bill, no "which provider do I use" decision. For an agency running three or four client locations, that convenience is genuinely worth something.
But convenience has a price, and it's baked into a per-message rate you don't set and can't see the components of. Somewhere between "a few clients" and "a real book of business," that price stops being a rounding error and starts being the difference between a healthy margin and a thin one. This post is about finding that line for your agency — and being honest about when you're nowhere near it.
Full disclosure: I work for ReadySMS, and we make an external sender that plugs into GHL. So I have a horse in this race. I'm going to show you the math anyway, including the cases where staying on LC Phone is the right call.
What you're actually paying for with LC Phone
LC Phone bundles three things you'd otherwise buy separately: the carrier send cost, the platform's markup, and the convenience of never leaving GHL. That bundling is the whole pitch — and also the whole problem. You can't audit a line item you can't see.
Every SMS provider pays roughly the same carrier pass-through — around $0.0045 per segment. That's the fee mobile carriers charge to move a registered 10DLC message. It's not markup; it's a cost of doing business that no provider escapes. We break this down in detail in the $0.0045 line item most providers bake in, but the short version: when a provider quotes you one blended "per-message" number, that carrier fee is hiding inside it along with their margin.
With LC Phone, you get the blended number. With a transparent external sender, you see the send rate and the carrier fee itemized separately. That legibility matters most when you're rebilling clients, because you can't defend a markup you can't explain.
The 10DLC friction tax (both ways)
Before we get to volume, a fairness point: LC Phone's 10DLC registration is genuinely streamlined. GHL walks you through brand and campaign registration inside the platform, and for a single-brand agency that's a real time save.
But an external sender doesn't reintroduce that friction the way people assume. With ReadySMS, A2P 10DLC is handled in-app — brand and campaign registration, roughly ~$10/mo per brand and ~$20/mo per campaign in carrier fees, approval typically 1–3 days. Same carrier registry underneath, same fees, same approval timeline.
Where an external provider pulls ahead is control. You own the brand and campaign registration, which means when a client leaves, the sender identity and opt-in history don't get tangled inside your GHL agency account. That's a bigger deal than it sounds — see who owns the opt-in list when a client leaves for why that clause belongs in your contract regardless of which route you pick.
The volume threshold: where switching pays off
Here's the honest framework. Below a certain monthly send volume, the delta between LC Phone's blended rate and a transparent per-segment rate is small enough that the convenience wins. Above it, the delta compounds and the switch pays for itself in weeks.
ReadySMS pricing, all-in (send rate + $0.0045 carrier), for context:
| Tier | Volume / month | Per segment | All-in |
|---|---|---|---|
| Starter | 0–50,000 | $0.0155 | $0.0200 |
| Growth | 50,000–500,000 | $0.0125 | $0.0170 |
| Enterprise | 500,000+ | as low as $0.0028 | as low as $0.0073 |
Now the math. Say your agency sends 80,000 segments/month across a handful of client locations — appointment reminders, promos, two-way conversations. On the Growth tier that's:
- 80,000 × $0.0170 all-in = $1,360/month
The exact LC Phone equivalent depends on your account rate, and I won't quote a competitor's per-segment number — that's a line I don't cross. But the structural point holds: a bundled, marked-up blended rate on 80,000 segments produces a monthly spend that, on a transparent tier, you'd be paying meaningfully less for. Run your own LC Phone rate through our cost calculator against these tiers and you'll see your specific delta.
The breakpoint isn't a single magic number — it's where your monthly savings clears the small overhead of running a second (transparent) bill. For most agencies that lands somewhere in the low tens of thousands of segments per month. Below ~20,000 segments, the savings are real but modest and the convenience of one bill is defensible. Above ~50,000, the tier math in this margin-by-tier breakdown shows how moving from a higher blended rate to a transparent per-segment rate adds hundreds to your margin without touching what you charge clients.
The rebilling angle agencies actually care about
If you rebill SMS to clients — and most growth-stage agencies do — the real question isn't "what does it cost me," it's "how much of the spread can I keep before a client audits the line item."
That's easier with a transparent sender because you can show the client exactly what the carrier fee is and mark up your service layer honestly. When your cost is $0.0170 all-in and you bill $0.03, you're capturing a defensible spread on a legible base. When your cost is a blended black box, you're marking up a number you can't itemize, which gets awkward the moment a savvy client asks.
We wrote a whole piece on how high you can rebill before clients start auditing. The takeaway that matters here: transparency at your cost layer gives you more room to mark up, not less, because you can always justify the number.
Compliance you carry with you
One thing external senders shouldn't cost you is compliance rigor. With ReadySMS, the send layer includes:
- Automatic STOP/opt-out handling that propagates across campaigns, so an opted-out contact stays opted out everywhere
- Quiet-hours enforcement based on recipient area, holding sends outside permitted local hours to reduce TCPA exposure
- Litigator / DNC scrubbing to screen known TCPA-litigator and DNC numbers before send
- Consent attestation capture for bulk and API sends, building an audit trail
None of this makes you lawsuit-proof — compliance is always the sender's responsibility — but it's the difference between "we have controls" and "we hope our workflows behaved." If your GHL workflows are double-texting contacts, no provider saves you; go audit them with this 20-minute workflow check first.
When you should just stay on LC Phone
I'll be the honest one here. Stay on LC Phone if:
- You're sending under ~15,000–20,000 segments/month and don't rebill aggressively. The savings won't clear the friction of a second bill.
- You have one or two clients and value single-pane simplicity over margin optimization.
- Your team is small enough that "one less integration to think about" has real operational value.
The switch pays off when you hit a growth inflection — more clients, higher volume, rebilling as a real revenue line, or a client base savvy enough to ask what the SMS line item actually costs. That's the trigger, not a calendar date. If you're weighing options broadly, our LC Phone alternative guide lays out the full comparison.
The practical takeaway
The decision comes down to three questions:
- What's my monthly segment volume, honestly counted? Below ~20K, convenience probably wins. Above ~50K, transparent per-segment pricing is likely leaving real margin on the table.
- Am I rebilling? If yes, a legible cost base is worth more than the raw savings, because it protects your markup.
- Do I need to own my sender identity and opt-in history? For agencies with client churn, yes — and that's easier when the registration lives outside your GHL account.
If you're past that inflection, the native GHL integration connects via OAuth with two-way sync mapped per location, so client isolation stays intact and inbound replies still land in GHL. You get 2,500 free credits to test it, no card required — run your real volume through the calculator first and let the delta decide. If the number's small, stay put. If it isn't, you already know.