OK, let's look at them confusing headers...

>whois 10641.com
No match for "10641.COM".

No surprises there.

>whois globalcenter.net
GlobalCenter, INC (GLOBALCENTER-DOM)
   1144 East Arques Avenue
   Sunnyvale, CA 94086
   us

   Domain Name: GLOBALCENTER.NET

   Administrative Contact:
      Primenet Network Operations Center  (PRM-NOC)  noc@PRIMENET.COM
      602-416-6400 / 800-404-7714
Fax- 602-416-6499
   Technical Contact, Zone Contact:
      ISI Operations Center  (ISI-NOC)  noc@ISI.NET
      (888) 541-9888
Fax- - - (408) 541-9878
   Billing Contact:
      Primenet Network Operations Center  (PRM-NOC)  noc@PRIMENET.COM
      602-416-6400 / 800-404-7714
Fax- 602-416-6499

   Record last updated on 27-Aug-97.
   Record created on 27-Sep-94.
   Database last updated on 30-Aug-97 04:34:09 EDT.

   Domain servers in listed order:

   S2AD1AA1.GLOBALCENTER.NET    198.93.142.5
   S1AD1AA1.GLOBALCENTER.NET    198.93.142.6
   S3AD1AA1.GLOBALCENTER.NET    198.93.142.7

>whois ISI.NET
Internet Systems, Inc. (ISI2-DOM)
   1111 Karlstad Drive
   Sunnyvale, CA 94089

   Domain Name: ISI.NET

   Administrative Contact:
      Heiliger, Jonathan  (JH219)  loco@ISI.NET
      408-543-0309 (FAX) 408-541-9878
   Technical Contact, Zone Contact:
      ISI Operations Center  (ISI-NOC)  noc@ISI.NET
      (888) 541-9888
Fax- - - (408) 541-9878
   Billing Contact:
      Heiliger, Jonathan  (JH219)  loco@ISI.NET
      408-543-0309 (FAX) 408-541-9878

   Record last updated on 05-Apr-97.
   Record created on 24-Apr-95.
   Database last updated on 30-Aug-97 04:34:09 EDT.

   Domain servers in listed order:

   NS1.ISI.NET                  205.216.163.20
   NS4.ISI.NET                  204.152.166.73
   NS2.ISI.NET                  206.251.8.20

>whois PRIMENET.COM
Primenet (PRIMENET-DOM)
   1224 E. Washington
   Phoenix, AZ 85034
   USA

   Domain Name: PRIMENET.COM

   Administrative Contact, Technical Contact, Zone Contact:
      Primenet Network Operations Center  (PRM-NOC)  noc@PRIMENET.COM
      602-416-6400 / 800-404-7714
Fax- 602-416-6499

   Record last updated on 22-Oct-96.
   Record created on 05-May-94.
   Database last updated on 30-Aug-97 04:34:09 EDT.

   Domain servers in listed order:

   DNS1.PRIMENET.NET            206.165.5.10
   DNS2.PRIMENET.NET            206.165.50.10
   DNS3.PRIMENET.NET            204.245.15.10

Whois: usvi.net
Octagon Consultants (USVI-DOM)
   c/o COBEX Internet Services
   Corporate Place, Royal Dane Mall
   St. Thomas, US Virgin Islands
   Charlotte Amalie, 00802
   VI

   Domain Name: USVI.NET

   Administrative Contact:
      Bastian, Calvin  (CB175)  Bastian@usvi.net
      (809) 776-4800
   Technical Contact, Zone Contact:
      Octagon DNS Administrator  (ODA2-ORG)  DNSadmin@USVI.NET
      (809) 776-4800
Fax- (809) 776-2666

   Record last updated on 04-Jan-97.
   Record created on 09-Dec-94.
   Database last updated on 30-Aug-97 04:34:09 EDT.

   Domain servers in listed order:

   NS1.OCTAGON.NET              208.200.188.2
   NS2.OCTAGON.NET              208.200.188.3
   KNOCK.SER.BBNPLANET.NET      192.239.16.129

So, an off-shore spam. Call within the country, bounce it outside the country so it
can be relayed back in.
But wait, there's more to see:

Whois: OCTAGON.NET
Octagon Consultants Int'l Inc (OCTAGON2-DOM)
   Corporate Place, Royal Dane Mall
   St. Thomas
   United States Virgin Islands 00802
   VI
   St. Thomas, 00802
   VI

   Domain Name: OCTAGON.NET

   Administrative Contact:
      Bartsch, Jonathan  (JB775)  jcb@USVI.NET
      (809) 776-4800
   Technical Contact, Zone Contact:
      USVI Domain Administrator  (UDA4-ORG)  DNS-admin@USVI.NET
      (809) 776-4800
Fax- (809) 776-2666
   Billing Contact:
      USVI Domain Invoices  (UDI-ORG)  DNS-invoice@USVI.NET
      (809) 776-4800
Fax- (809) 776-2666

   Record last updated on 15-Dec-96.
   Record created on 12-May-95.
   Database last updated on 30-Aug-97 04:34:09 EDT.

   Domain servers in listed order:

   NS1.OCTAGON.NET              208.200.188.2
   NS2.OCTAGON.NET              208.200.188.3
   AUTH03.NS.UU.NET             198.6.1.83
   AUTH51.NS.UU.NET             198.6.1.162

UU.net. Gee, more spam.

All other domains are fake. This came right off Sprint.