AT&T · Home · Analog · Corded · With Caller ID This AT&T TR1909 Trimline with caller ID/call waiting can be used either in tabletop or wall installation position. The telephone can still operate with limited features when there are no batteries installed. The TR1909 also features a 13-number memory for fast dialing and has a call log which can store up to 80 additional numbers with names. This telephone has a caller ID feature which supports caller ID with call waiting service