AT&T landline phone refuses calls from my T-Mobile cellular phone

Yes, we can call all numbers with our T-Mobile cells. We just can't get
through to our AT&T landline home phone. We always get either a busy signal
or a recording that says the number you have dialed is not in service or you
have dialed the wrong number and to please check the number and dial again.
Well, the home number certainly is in service and we have not dialed the
wrong number. We've tried to dial the 10-digit no. with area code, a 1
before the 10-digit no., and the 7-digit no. with no area code.always get
either a busy signal or that same recording.



We've had our same home phone no. for 11 years. We've changed carriers twice
over these past 11 years to take advantage of better deals. We've had
T-Mobile cells for over a year. Never had a problem calling home from
cells..until now.



I might also add that we switched TV-internet-phone (home) service from
Spectrum to AT&T two weeks ago and were given a temporary home phone no.
until our old no. could be ported by AT&T several days ago. We did not have
a problem calling that temporary no. from our T-M cells when we had
Spectrum. It all began on the same day AT&T ported our old no. and it
became available and activated through AT&T.



Both AT&T and T-Mobile are supposed to be investigating the problem, but so
far neither have been able to tell me why it is happening or what can be
done to correct it. I was just wondering if anyone else has had this issue
and how was it resolved.



Thanks.

Yes, others can call the AT&T phone.  If the problem is with the T-Mobile cells as you say, then why would it coincidentally start at the same time  AT&T ported the number?  We had no problems calling home with T-Mobile cells prior to the changeover from Spectrum to AT&T.

Ahhh, that sounds plausible. We'll see if T-Mobile agrees and can resolve this issue.  Thank you so much for your help! 

I misstated the following:

Spectrum's tables were correct to route it to AT&T and the correct switch at AT&T, T-Mobiles isn't. It's that simple. 

Should read T-Mobiles routing was correct to Spectrum so that's why it worked, the routing tables are wrong to AT&T and that's why it doesn't.  Sorry, but at least you caught the gist of what I was trying to state.  It wouldn't surprise me if they are still routing the number to Spectrum, it can take a few days for all data bases to get updated.