Smart Start Ignition Interlock

Smart Start of San Antonio – East

4420 N INTERSTATE 35
San Antonio, TX 78218

#1 Ignition Interlock from $1.99/day

No Long Term Contracts

Same-day installation available

(915) 304-5949

Book your install now

Hours of Operation:

Day	1st Hour Block	2nd Hour Block
Sun	Closed
Mon	8:00am - 5:00pm
Tue	8:00am - 5:00pm
Wed	8:00am - 5:00pm
Thu	8:00am - 5:00pm
Fri	8:00am - 5:00pm
Sat	Closed

Services at this Location:

Installations
Calibrations

Book an Installation

With the thousands of locations across the nation, 24/7 customer support, no hidden fees and the most reliable device on the market, Smart Start Ignition Interlock devices are hands-down the best way to get you back on the road fast.

Get a quick and easy IID installation with Smart Start! Get started today!

¡Obtenga una instalación rápida y fácil de IID con Smart Start! ¡Empieza hoy mismo!

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Interested in an IID ASAP (within 7 days)

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I am a current customer and need customer service

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Or Call (915) 304-5949 Now!

¡O llame ahora al (915) 304-5949!

Why Choose Smart Start Ignition Interlock?

From $1.99/Day* - No Long-Term Contracts

Bi-weekly payment options designed to fit your budget.

IGNITION INTERLOCK COSTS

3,000+ Locations - Same Day Install

Quick installs by skilled technicians at convenient U.S. locations.

FIND A LOCATION

Discreet, Easy-to-Use Devices

Reliable, hygienic devices with guided tests and easy English-Spanish switching.

SMART START DEVICES

24/7 Knowledgeable State Program Experts

Multilingual support trusted by over 1 million people, ready when you need us.

TALK TO A PROGRAM ADVISOR

#1 Ignition Interlock Device Provider at Smart Start of San Antonio - East in San Antonio

Name: Smart Start of San Antonio – East
Address: 4420 N INTERSTATE 35, San Antonio, TX, 78218, US
Telephone: (915) 304-5949
Rating: 5

If you need an Ignition Interlock Device installed quickly in the San Antonio, Texas area, Smart Start leads the way. Our convenient program offers affordable costs, reliable Ignition Interlock and a friendly customer care team ready to answer questions 24/7/365.

Schedule an Ignition Interlock installation appointment at Smart Start of San Antonio - East, and we will have you back on the road quickly. The shop is located at 4420 North I-35 Frontage Road near Winnco Drive.

Let us serve your Ignition Interlock needs! Schedule your breathalyzer installation now by calling (915) 304-5949 or by filling out our online form.

Look for other convenient Smart Start locations in San Antonio, Alamo Heights, Terrell Hills, or throughout Texas.

Driving Directions

Near Winnco Drive

(915) 304-5949

Frequently Asked Questions

How much does an Ignition Interlock Device cost in Texas? What are the fees?

The overall cost of an Ignition Interlock Device is a combination of installation fees, monthly service fees, and removal fees. Exact pricing varies by state. To get a quote today, call (800) 831-3299 to speak with a friendly Program Advisor.

How often does my IID need to be serviced in Texas?

Texas mandate dictates that you will need to service your Ignition Interlock Device (IID) once every 30-67 days as determined by your jurisdiction.

What do I need to bring to my installation in San Antonio?

Once you have scheduled your Ignition Interlock Device (IID) installation with Smart Start, you will need to bring the following to your IID installation appointment:

Two forms of photo identification
Any and all court paperwork that has been given to you
Proof of residence
Car insurance and vehicle registration

If the vehicle is not yours, you will need to provide a letter of permission from the owner of the vehicle stating that you are allowed to install an Ignition Interlock Device.

How can I pay for calibration?

In Texas, you can pay for your Interlock Device calibration via credit card at the Smart Start service center at the time of calibration or via the online Client Portal.

What constitutes a violation in Texas?

In Texas, any and all of the following may constitute a violation:

Testing at or above the fail level of .030
Skipping or failing a rolling re-test
Missing your scheduled IID service appointment

Learn more about Interlock Device violations.

Where can I go for service? Anywhere, or just within my state?

Texas state law dictates that you can service your Ignition Interlock Device at any Smart Start service center nationwide unless informed otherwise by your State authority. Find the nearest Smart Start service center here.

Nearby Locations

Alamo 4×4, LLC

2800 NE Loop 410
San Antonio, TX 78218

CLOSED – Opens at 9:00am Mo

Services at this Location:

(210) 202-0001 More Details

STEER AUTOMOTIVE & TIRE

10502 IH-35
San Antonio, TX 78233

CLOSED – Opens at 8:00am Mo

Services at this Location:

(210) 835-0173 More Details

Smart Start of San Antonio

2525 BOARDWALK ST
San Antonio, TX 78217

CLOSED – Opens at 8:00am Mo

Services at this Location:

Installations, Calibrations

(915) 304-5951 More Details

See What Everyone Says About Our Ignition Interlock

Excellent TrustScore Rating

February 21, 2026

"Very friendly and informational. Reassured me that they try to make it as painless as possible."

Neil V.

United States

February 21, 2026

"The guy told me everything I needed to do and help me out a lot!!!"

Frank Alexander III.

United States

February 21, 2026

"I had a very bad experience with Lifsavor/Guardian Interlock services. I called Smart Start and spoke with Itzel. She was very professional and polite. Not at all at Guardian. She went over the program in detail and answered all my questions in detail. It was very uplifting to talk with a positive sales rep after the degrading respect I received from the Guardian reps. Thank you so much for making this negative a positive for me! Tim "

timothy christian.

United States

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Find a location near you!

Smart Start of San Antonio – East

Hours of Operation:

Services at this Location:

Book an Installation

Fast-Track Your Installation

Want to speed up the installation appointment process?
We can get you a quote faster if you fill out the information below.

Or Call (915) 304-5949 Now!

¡O llame ahora al (915) 304-5949!

From $1.99/Day* - No Long-Term Contracts

3,000+ Locations - Same Day Install

Discreet, Easy-to-Use Devices

24/7 Knowledgeable State Program Experts

#1 Ignition Interlock Device Provider at Smart Start of San Antonio - East in San Antonio

Driving Directions

Frequently Asked Questions

Nearby Locations

Alamo 4×4, LLC

Services at this Location:

STEER AUTOMOTIVE & TIRE

Services at this Location:

Smart Start of San Antonio

Services at this Location:

Get Started

Locations

Support

Partners

Contact Us

Find a location near you!

Smart Start of San Antonio – East

Hours of Operation:

Services at this Location:

Book an Installation

Fast-Track Your Installation

Want to speed up the installation appointment process?We can get you a quote faster if you fill out the information below.

Or Call (915) 304-5949 Now!

¡O llame ahora al (915) 304-5949!

Why Choose Smart Start Ignition Interlock?

From $1.99/Day* - No Long-Term Contracts

3,000+ Locations - Same Day Install

Discreet, Easy-to-Use Devices

24/7 Knowledgeable State Program Experts

#1 Ignition Interlock Device Provider at Smart Start of San Antonio - East in San Antonio

Driving Directions

Frequently Asked Questions

Nearby Locations

Alamo 4×4, LLC

Services at this Location:

STEER AUTOMOTIVE & TIRE

Services at this Location:

Smart Start of San Antonio

Services at this Location:

See What Everyone Says About Our Ignition Interlock

Get Started

Locations

Support

Partners

Contact Us

Want to speed up the installation appointment process?
We can get you a quote faster if you fill out the information below.