SMS API for Guam: bulk SMS to +1 numbers

Guam, a U.S. territory in the western Pacific, has Hagåtña as its capital and an economy centered on tourism and military activities. These messages are triggered by events such as booking confirmations, reservation reminders, or tour updates. SMS is chosen because it is reliable, works on all devices, and is read quickly, even by tourists and visitors.

Guam

Calling code +1

Per SMS segment
$0.00617
Messages for $100
16,207
Local language
English
Encoding
GSM-7

What a bulk SMS send to Guam costs

Every message is priced at $0.00617 per segment to Guam. Texts over 160 GSM-7 or 70 Unicode characters are split into segments, so a two-segment text costs twice as much.
Messages1 segment2 segments
1$0.00617$0.01234
1,000$6.17$12.34
10,000$61.70$123.40
100,000$617.00$1,234.00

Number format in Guam

Guam uses the North American Numbering Plan: +1, a three-digit area code and a seven-digit number, such as +1 671 300 1234. The API reads the area code (671 here) to price the number as Guam rather than the United States, so keep the full eleven digits in your list.

Alphabet and segments

English text stays inside the GSM-7 alphabet, so one segment to Guam holds 160 characters and each part of a longer text 153. Watch for curly quotes and emoji copied from other tools: one of them moves the whole text to Unicode at 70 characters per segment, and POST /v1/estimates shows the encoding before you send.

Time zone and timing

Guam keeps UTC+10 all year with no clock change, so 09:00 in Guam is always 23:00 UTC. send_at takes UTC or any ISO 8601 offset, and the console scheduler converts from your own time zone.

Send to Guam with one request

The answer comes back at once with the message id, the country the number was matched to (GU) and the price. A delivered or failed event follows on your webhook, and a failed message is refunded.

For a list, send the same text to up to 10,000 numbers with POST /v1/batches, or a personal text per number in messages.

curl https://bulksmsapi.cc/v1/messages \
  -H "Authorization: Bearer $BULKSMSAPI_KEY" \
  -H "Content-Type: application/json" \
  -d '{"to": "+16713001234", "text": "Your Northwind code is 482913. It expires in 10 minutes."}'

What developers send to Guam

Common integrations that call the SMS API for recipients in Guam.

Booking confirmations

Hotels in Tumon send SMS confirmations to guests about their room reservations and check-in details.

Reservation reminders

Car rental agencies in Hagåtña notify customers about upcoming pick-up times and locations.

Event notifications

Cultural venues in Dededo notify attendees about festival times and ticket availability.

SMS to Guam: questions

More answers on accounts, payments and the API are in the FAQ.

How much does it cost to send bulk SMS to Guam?

Each message segment to Guam costs $0.00617. A plain text of up to 160 characters is one segment, so 1,000 one-segment messages cost $6.17 and 10,000 cost $61.70. Failed messages are refunded to the balance.

How many SMS to Guam does a $100 top-up send?

$100 covers about 16,207 one-segment messages to Guam at $0.00617 each. The first top-up adds a bonus on top, which raises that number. The balance is shared by every country, so the same top-up also pays for messages anywhere else on the list.

How do I write Guam numbers for the API?

Send them in international format with the plus sign: +1 671 300 1234 becomes "+16713001234" in the to field. The API also accepts spaces, dashes and a 00 prefix and cleans them, and numbers that cannot be read are listed in set_aside instead of being charged.

Should SMS messages be sent in English or Chamorro?

English is widely used and understood, while Chamorro is appreciated for local cultural events.

Are there peak times for SMS traffic?

Peak times occur during the tourist season and around major holidays like Liberation Day.

Start sending to Guam

Create an account, top up from $40 and send to Guam at $0.00617 per segment, from the console or with one API call.

SMS API Guam: Bulk SMS to +1 From $0.00617 | BulkSMSAPI