SOUTHWESTERN BELL<SBC> VOTES SPLIT, UPS PAYOUT Southwestern Bell Corp said its board voted a three-for-one stock split and increased the dividend 8.8 pct to 1.60 dlrs a share. On a post-split basis, the increased dividend will be 58 cts a share, payable May One to holders of record April 10. Southwestern Bell said the stock split is its first. It said shares will be mailed May 22, record May Four.