How can I forward my calls from cordless phone (Panasonic Model No# KX-TGCA21S) to my cellphone

Have one of these bluetooth answering systems. they link to your cell phone to allow it to be used on cell headset mode instead of hunting for a handset. Handy but I have gone away from that after a year. The forwarding your are talking about is not initiated from the cell phone (I guess it could be) but from a cordless handset. And if properly paired, why do it? Your cell phone responds to the base and allows all functions. Answer, place calls etc. From the land line not your sell phone.

If it was done through your service provider, contact them.
links to the manual below, press the helpful button

https://www.panasonicstore.ie/wp-content/uploads/2015/05/KXTGC210-KXTGC220-ALL.pdf

http://yourpdfguides.com/user-manual/PANASONIC/KX-TGC220__5644791.pdf

https://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&cad=rja&uact=8&ved=0ahUKEwjP7Z6wwvDKAhXC1R4KHb-kBhcQFggqMAM&url=http%3A%2F%2Fwww.panasonic.com%2Fcaribbean%2Fconsumer%2Ftelecommunications%2Fdect-cordless%2Fkx-tgc220.specs.html&usg=AFQjCNGWB4NKwk9AkVS186CiRb3y7bOdWQ

https://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0ahUKEwjP7Z6wwvDKAhXC1R4KHb-kBhcQFgggMAE&url=http%3A%2F%2Fmy.speechpath.ie%2Fdl.php%3Ftype%3Dd%26id%3D58&usg=AFQjCNF-qCdDYkt20JAZMr0EauJ6l_v4cg

You can transfer a call between units, but you cannot forward to a different phone number. Page 48 of the manual details this: http://service.us.panasonic.com/OPERMANPDF/KXTG2357.PDF

Assuming your telephone service provider offers the call forwarding service, yes. The procedure varies from company to company, but often you dial *72 from the landline, then the number to which you want the calls forwarded. That phone will then ring, and you must answer the call to confirm. To cancel the call forwarding, dial *73 from the landline.

If this doesn't work, contact your telephone service provider for their instructions regarding call forwarding.

Setup your personal Shaw "My Account" ID & password.
Then, login to: https://phone.shaw.ca
and click "features", and enable call-forwarding.
Type in the phone-number of your BlackBeery.

http://www.ehow.com/how_4794323_turn-off-call-forwarding.html
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Call forwarding isn't a "feature" on a telephone. You have call transfer to another handset, probably described in your manual, or Central Office call forwarding, the standard CF that works without the TG6500. You set that by following the CF instructions provided by your dial tone provider, usually a sequence that starts with 72#.

Carl

for me, its *72, but i think it depends on your phone company.

http://www.retrevo.com/search/v2/jsp/mytrevo/myTrevo.jsp?page=man

try using the call forwarding feature, you can forward it to your cellphone.