SMS Connect: How to Send SMS from Your Android Phone

SMS Connect sends real SMS from the SIM card in your own Android phone (through the SMS Bridge app) straight into your GoHighLevel conversations. That makes it great for one-to-one conversations. But your SIM is a regular mobile line, and every carrier watches lines for bulk or spam-like traffic. This guide explains how to use SMS Connect safely, anywhere in the world, so your number stays healthy.

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New to SMS Connect? Start with the setup guide: How to set up SMS Connect (Android SMS Bridge)

Why phone lines get blocked

Carriers look at three things: volume (many messages in a short time), repetition (the same or nearly the same text to many people) and complaints (people reporting you as spam). A line that looks like a bulk sender can be filtered, restricted or suspended, often with no warning. Carriers almost never publish an exact limit, so the safest strategy is simple: behave like a busy human, not a broadcast tool.

  • Replying to inbound leads (forms, ads, calls, website chat)
  • Two-way conversations with prospects and customers
  • Appointment confirmations and reminders
  • Follow-ups with people who already know your business
  • Missed-call text-back
  • Review requests to recent customers

What not to do ❌

  • Bulk blasts or promotions to hundreds or thousands of contacts
  • Cold lists, scraped lists or purchased lists
  • Sending the same text to everyone at once
  • High-volume one-time codes (OTP) or alerts
  • Rotating several SIMs to spread out one big campaign ("snowshoeing"). Carriers treat this as abuse.

For mass marketing, use a registered business SMS provider instead (in GoHighLevel, LC Phone / Twilio with A2P 10DLC registration in the US, or an alphanumeric sender ID where your country supports it).

Open SMS Bridge → Settings → Messages ("Delays, limits, etc."):

Setting Recommended value
Delay between messages Random, min 20 s / max 45 s
Limit Per hour, about 30 messages

By default these are off, so set them yourself. These numbers are conservative recommendations from our team, not official carrier limits. Your carrier may be stricter or more relaxed.

Android itself also shows a warning ("this app is sending a large number of SMS") after roughly 30 messages in a short period. If you see it, that's a sign you're sending too fast.

Warm up your line

A new or quiet number that suddenly sends lots of messages looks suspicious. Ramp up gradually (our estimates, not carrier rules):

  • Week 1: up to ~50 SMS per day
  • Week 2: up to ~100 SMS per day
  • After that: up to ~200 SMS per day per SIM, mostly to people who reply

Only raise volume while replies stay healthy and you see no failures or complaints.

Rules for your message text

  • Personalize: use the contact's name and context (e.g. {{contact.first_name}} in GoHighLevel).
  • Vary the wording. Avoid identical messages to many people.
  • No links in the first message, and never URL shorteners like bit.ly. Send links only after the person replies.
  • Say who you are (your name and business).
  • No ALL CAPS, no "FREE!!!", no excessive emojis.
  • Keep it short: 160 characters is one SMS. Emojis and some accented characters switch to a different encoding where one SMS is only 70 characters, so long texts are split into several messages.
  • Only text people who gave you their number and expect to hear from you.
  • Add "Reply STOP to opt out" to your first message and to any marketing message.
  • When someone replies STOP, mark the contact as DND (Do Not Disturb) for SMS in GoHighLevel right away so no workflow texts them again. You can automate it with a GoHighLevel workflow that sets DND when an inbound message contains "STOP".
  • Keep a record of when and how each contact gave consent.

Rules by region

This is a general guide, not legal advice. Check the rules where you and your contacts are, and confirm with your carrier and a lawyer if you're unsure.

Mexico

  • Use a business plan when your carrier offers one. Personal plans are meant for personal use.
  • Profeco runs the REPEP (Registro Público para Evitar Publicidad). Don't send marketing to numbers registered there.
  • Privacy law on personal data applies: tell people how you use their data and honor opt-outs.

United States

  • Under the CTIA Messaging Principles, anyone texting on behalf of a business is a business ("non-consumer") sender and needs consent, even from a personal phone.
  • Business traffic from unregistered numbers is heavily filtered. Volume marketing must go through A2P 10DLC registration (e.g. LC Phone / Twilio in GoHighLevel), not a phone SIM.
  • The TCPA carries large penalties for texts sent without proper consent, and some states add stricter "mini-TCPA" laws. Be extra careful with marketing.

European Union (example: Portugal)

  • Marketing SMS to individuals needs prior consent under the ePrivacy Directive, and GDPR applies: a lawful basis, records of consent and an easy opt-out.
  • Carriers forbid bulk use of personal plans. For example, Portugal's NOS prohibits "identical or nearly identical messages in large numbers" and promoting a business from personal plans, and can restrict the SIM. MEO also monitors for abusive use. Neither publishes a number, so use a business plan and ramp up slowly.

Brazil

  • LGPD applies: have a legal basis (usually consent) and an easy opt-out.
  • Carriers actively block spam lines, and Anatel pushes them to fight abusive messaging. Keep volume low and conversational.

Rest of Latin America

  • Most countries have data-protection laws and carriers with fair-use rules for personal plans. Do-not-call/do-not-contact registries exist in several countries (for example Colombia and Argentina). Same rule everywhere: consent, low volume, real conversations.

Warning signs: stop and slow down

  • Messages show SENT but never DELIVERED
  • A sudden jump in failed messages
  • An SMS or notice from your carrier
  • Android's "sending a large number of SMS" prompt
  • Contacts saying your messages didn't arrive

If you see any of these, pause sending for 24 hours, then restart at a lower volume with longer delays.

Quick checklist

  1. Only text contacts who gave you their number.
  2. Use SMS Connect for conversations, not blasts.
  3. Set a random 20–45 s delay and ~30/hour limit in SMS Bridge.
  4. Warm up new lines gradually.
  5. Personalize and vary your messages.
  6. No links or shorteners in the first message.
  7. Include "Reply STOP to opt out" and set DND in GoHighLevel.
  8. Use a business mobile plan where available, one SIM per workspace.

FAQ

Is there a daily SMS limit? Carriers rarely publish one, and it varies by country and plan. Follow the warm-up above and watch the warning signs.

Can I use two SIMs to send more? Only as separate numbers for separate purposes or workspaces. Don't split one campaign across SIMs to avoid limits.

Can I send marketing campaigns? Small, consented, personalized follow-ups are fine. For true bulk marketing, use a registered business SMS provider.

Related: How to set up SMS Connect (Android SMS Bridge)

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