Area code 671 calling hours: can you call now?

Area code 671 serves Agana in Guam. It is on Chamorro time. There is no daylight saving time here, so the local clock does not change in March or November — but its gap to the rest of the country does.

Debt collection: federal — Presumed convenient 8 a.m.-9 p.m. local time at the consumer's location, any day. Guam: no separate hour rule.
Telemarketing: federal — 8 a.m.-9 p.m. local time at the called party's location, any day. Guam: no separate hour rule.

Live check: area code 671

Turn on JavaScript for the live check. The rules table below lists every window that applies to 671.

Not checked here: consent, Do-Not-Call lists, Reg F call frequency (7 calls in 7 days), cease-communication requests or attorney representation, reassigned numbers, and whether the consumer has told you a time is inconvenient.

Calling-hour rules for 671

Hours are local time at the person you are calling. When federal and Guam rules differ, the narrower window governs; the live check applies every row at once.

Rule set	Debt collection	Telemarketing
Federal	Presumed convenient 8 a.m.-9 p.m. local time at the consumer's location, any day. Every day 8:00 a.m.–9:00 p.m. 15 U.S.C. § 1692c(a)(1) · 12 CFR § 1006.6(b)(1)(i) (Regulation F) · Reg F Official Interpretation, comment 6(b)(1)(i)-2 (consumer's location) · 12 CFR § 1006.14(b)(2) Call-frequency presumption: a collector is presumed to comply with the harassment ban if it places no more than 7 calls to a person about a particular debt within 7 consecutive days, and no call within 7 days after a telephone conversation with that person about the debt; exceeding either is presumed a violation (12 CFR § 1006.14(b)(2)). Conflicting location information: if the collector's information indicates the consumer may be in more than one place (e.g. an Eastern-zone area code and a Pacific-zone address), it complies only by calling at a time convenient in all of those locations (Reg F comment 6(b)(1)(i)-2). A collector may not call at any time it knows or should know is inconvenient to the consumer (e.g. after the consumer says so), regardless of the 8 a.m.-9 p.m. default (15 U.S.C. § 1692c(a)(1); Reg F comment 6(b)(1)-1). No federal Sunday or holiday ban, but a consumer's statement that a day or time is inconvenient makes calls then unlawful. The 8-9 window is a default presumption that the consumer's prior consent (given directly to the collector) or a court can override.	8 a.m.-9 p.m. local time at the called party's location, any day. Every day 8:00 a.m.–9:00 p.m. 47 CFR § 64.1200(c)(1) (TCPA rules) · 16 CFR § 310.4(c) (Telemarketing Sales Rule) No telephone solicitation to a number on the National Do Not Call Registry absent an established business relationship or the consumer's signed written permission (47 CFR § 64.1200(c)(2); 16 CFR § 310.4(b)(1)(iii)(B)). Autodialed or artificial/prerecorded-voice telemarketing calls to wireless numbers, and prerecorded telemarketing calls to residential lines, require the called party's prior express written consent (47 CFR § 64.1200(a)(2)-(3)). Sellers must honor company-specific do-not-call requests (47 CFR § 64.1200(d); 16 CFR § 310.4(b)(1)(iii)(A)). TSR § 310.4(c) allows calls outside 8-9 with the person's prior consent; the TCPA time rule in § 64.1200(c)(1) has no consent exception for telephone solicitations as defined.
Guam	No separate state hours; the federal window applies.	No separate state hours; the federal window applies.

Debt collection

Telemarketing

Federal

Presumed convenient 8 a.m.-9 p.m. local time at the consumer's location, any day.

Every day 8:00 a.m.–9:00 p.m.

15 U.S.C. § 1692c(a)(1) · 12 CFR § 1006.6(b)(1)(i) (Regulation F) · Reg F Official Interpretation, comment 6(b)(1)(i)-2 (consumer's location) · 12 CFR § 1006.14(b)(2)

Call-frequency presumption: a collector is presumed to comply with the harassment ban if it places no more than 7 calls to a person about a particular debt within 7 consecutive days, and no call within 7 days after a telephone conversation with that person about the debt; exceeding either is presumed a violation (12 CFR § 1006.14(b)(2)).
Conflicting location information: if the collector's information indicates the consumer may be in more than one place (e.g. an Eastern-zone area code and a Pacific-zone address), it complies only by calling at a time convenient in all of those locations (Reg F comment 6(b)(1)(i)-2).
A collector may not call at any time it knows or should know is inconvenient to the consumer (e.g. after the consumer says so), regardless of the 8 a.m.-9 p.m. default (15 U.S.C. § 1692c(a)(1); Reg F comment 6(b)(1)-1).

No federal Sunday or holiday ban, but a consumer's statement that a day or time is inconvenient makes calls then unlawful. The 8-9 window is a default presumption that the consumer's prior consent (given directly to the collector) or a court can override.

8 a.m.-9 p.m. local time at the called party's location, any day.

Every day 8:00 a.m.–9:00 p.m.

47 CFR § 64.1200(c)(1) (TCPA rules) · 16 CFR § 310.4(c) (Telemarketing Sales Rule)

No telephone solicitation to a number on the National Do Not Call Registry absent an established business relationship or the consumer's signed written permission (47 CFR § 64.1200(c)(2); 16 CFR § 310.4(b)(1)(iii)(B)).
Autodialed or artificial/prerecorded-voice telemarketing calls to wireless numbers, and prerecorded telemarketing calls to residential lines, require the called party's prior express written consent (47 CFR § 64.1200(a)(2)-(3)).
Sellers must honor company-specific do-not-call requests (47 CFR § 64.1200(d); 16 CFR § 310.4(b)(1)(iii)(A)).

TSR § 310.4(c) allows calls outside 8-9 with the person's prior consent; the TCPA time rule in § 64.1200(c)(1) has no consent exception for telephone solicitations as defined.

Guam

No separate state hours; the federal window applies.

Also in Guam

No territory-specific calling-hour rule found. Guam's telemarketing article (5 GCA §§ 32301–32308) requires registration and disclosures but sets no calling hours (verified in the Compiler of Laws text of 5 GCA ch. 32). No Guam debt-collection hours statute located. Federal rules apply. Confidence medium for telemarketing, low for debt collection.

Exchanges and time zones

Every assigned exchange in 671 sits in Chamorro time, so the area code alone settles the zone for a landline. Rate centers by exchange count:

Rate center	Exchanges
Agana, GU	95

671 has no overlay codes.

Why area code alone is not enough

Mobile numbers travel with their owners, and a ported number keeps its original 671 area code and exchange. A 671 number tells you where the line was assigned, not where the person is today.
Under Regulation F, when you know of more than one location for a consumer — a mailing address in one zone, an area code in another — the time must be convenient in every one of them. Use the address-state field above to add the zones you know about.
Call only when the window is open in every location you know about, and stop calling at times the consumer tells you are inconvenient, whatever the clock says.

Questions

What time can you call area code 671?

Area code 671 is in Guam, on Chamorro time. Debt collection: federal — Presumed convenient 8 a.m.-9 p.m. local time at the consumer's location, any day. Guam: no separate hour rule. Telemarketing: federal — 8 a.m.-9 p.m. local time at the called party's location, any day. Guam: no separate hour rule.

What time zone is area code 671?

Area code 671 is entirely in Chamorro time. There is no daylight saving time here, so the local clock does not change in March or November — but its gap to the rest of the country does.

Can a debt collector call a 671 number on Sunday?

Neither federal law nor Guam sets separate Sunday hours for debt collection; the 8 a.m.–9 p.m. local-time window applies, and a consumer can tell a collector that Sunday is inconvenient.

Is the 671 area code enough to know the person's local time?

No. Mobile numbers move with their owners and ported numbers keep their area code, so a 671 number may belong to someone in another time zone. If you know other locations for the person, the call should fit the window in all of them.

Sources

This page is general information, not legal advice. Laws change and some rules depend on who is calling and why; confirm with counsel. Rules last reviewed 2026-10-07.