Gift of tongue speaking does not exist today, just as baptism with the Holy Spirit does not exist today.
No one today speaks in tongues as they did in the Bible. Tongue speaking in the Bible was NOT 'ecstatic utterances' but was speaking in known earthly languages that the speaker formerly did not know in order to take the gospel to the world, take the gospel to people that spoke a different language then the preacher of the gospel.
The gift of tongues, and for that matter, none of the Spiritual gifts have ceased as the Holy Spirit that indwells us has not been taken up to the realm of God as of yet.
Tongues is a Spiritual gift like all the gifts in 1 Corinthians 12 given by God through His Holy Spirit for His Church, (body of Christ), to lift up and edify, or to discipline the Church, 1 Corinthians 14:1-5. This began on the day of Pentecost with those 120 that were gathered together in the upper room that day as they were baptized in the Holy Spirit just as we are today and all those after us until the return of Christ. On the day of Pentecost there were around 3000 that day added to the Church, Acts 2:38-47. None of these gifts have ever ceased.
Luke 3:16 John answered, saying unto them all, I indeed baptize you with water; but one mightier than I cometh, the latchet of whose shoes I am not worthy to unloose: he shall baptize you with the Holy Ghost and with fire
Act 1:5 For John truly baptized with water; but ye shall be baptized with the Holy Ghost not many days hence.
1 Corinthians 12:10 To another the working of miracles; to another prophecy; to another discerning of spirits; to another divers kinds of tongues; to another the interpretation of tongues:
Tongues are a manifestation of the Holy Spirit and evidence that we are indwelled with the Holy Spirit as we exercise this gift. Tongues are also for our personal prayer language for things we do not know how to pray for as the Holy Spirit makes intercession for us. It may sound like babble to us at first, but perfected in us as we exercise this gift given by God to perfect us.
Romans 8:26 Likewise the Spirit also helpeth our infirmities: for we know not what we should pray for as we ought: but the Spirit itself maketh intercession for us with groanings which cannot be uttered.
Speaking in tongues does not affect salvation, but it is a part of being baptized in the Holy Spirit. Not all have this gift for many have never been taught that there even is such a gift. I not only love to pray in tongues as it helps my mind not to wonder when I'm praying, but also I love singing in tongues when I am by myself. No one could explain that kind of closeness to God.